Whipspider has truly outdone themselves with this butt plug. The material is squishy and the coloring is fun yet classy. As with most of their toys, this one glows in the dark! I am happy to say that it glows very well. It does not take a lot of light to make this one glow. The Screw comes in two sizes, the Screw and the Screw Royal. I do not think beginners should jump to this one, but I honestly believe that beginners would have little trouble with the smaller Screw. The material is super forgiving, so the diameter feels smaller than it looks. I think the Screw Royal is best for intermediate users. Advanced users might like it in the beginning due to the swirled texture, but might outgrow it and therefore become bored with it.
Obviously for this toy to be safe for your bum it will need a flared base, and it does. The base makes this toy great for long term wear, but more on this later. This plug lacks a curve some may need for proper prostate stimulation. Feast your eyes on this gorgeous toy!

The silicone for this plug seems way different than that of Whipspider's Jellyfish. The Jellyfish was very firm compared to this plug. It is like night and day. The Screw Royal is extremely plush, soft, flexible, and squishy. All of these factors make this plug amazing for long term wear and for wearing it during intercourse with a partner. The flexibility did not give me any trouble when it came to inserting the plug. The neck is just thick enough to give support when applying pressure during insertion. The most flexible parts of the toy is the tip of the head, the neck, and the base. The silicone has a decent amount of drag, but a couple squirts of water based lube can remedy this. As with most silicone, this toy also collects a considerable amount of hair and lint. Silicone is known for being non porous, hypo-allergenic, and smell/taste free. It can also be sanitized by boiling or bleaching.
The Screw Royal gets its' name for the spiral texture (that resembles a screw) that goes all along the head/shaft. The screw texture does not run very deep so it can be felt when inserting, but it cannot be felt once it is inside. The neck and base is completely smooth except for the Whipspider logo that is located on the bottom of the base.

This plug starts out with a small, squishy tapered tip. To insert the shaft, you can either twist it like a screw or slide it in like you would a regular plug. I have to say that I was able to feel the texture more when I inserted it regularly, but twisting it is super fun as well. The neck is pretty thick yet very flexible, which is great whenever you are sitting with it in. The base sits comfortably between my cheeks, but those with less ample bums might find the base to be too thick for comfort. The base is a little more firm when compared to the neck. This makes a great handle when inserting. It also could work in a harness. I wish I could tell you how well it worked in a harness, but I do not have a harness to put it in.
This plug comes in three different color combos-blue/black, blue/lavender, black/white. Sadly only the black and white one glows in the dark. Mine has more white than the product page shows, but this is bound to happen as each one is made by hand. Because mine has more white in it, it glows really well.
While the plug is not shaped like a penis, it is obviously a sex toy of some kind.
The size is a little bigger than average. However, the material is so plush that is does not feel that large. My plug measures differently than what the product page says, but the size is still effective.
Measurements:
Total length-4 1/4"
Insertable length-3 1/2"
Diameter-1 5/8"
Length of base-2 3/4"
Width of base-3/4"
Length of neck-3/4"
Diameter of neck-1"
The first photo below is comparing the size next to Happy Valley's Joe Rock plug (review on that toy to come up later).

I have used quite a number of butt plugs, but this one has managed to quickly become a favorite of mine for long term wear. I have found every part of this toy to be very comfortable. I can wear this toy for 2 hours at a time before I have to take it out and let my bum rest. Some might find the neck to be too short and thick, and therefore hard to keep in. I, however, have not had a problem with it popping out during sex or long term wear.
The glow in the dark feature only last 5-10 minutes before it fades away. I read previous reviews stating that the base did not glow as well as the rest of the toy, but that was not the case with mine. Here are some pics to show you just how well it glows.

After using the toy, I wash with warm water and antibacterial soap. You can also use your favorite toy cleaner, boil it for 3-5 minutes, or wipe down with a 10% bleach solution.
Another deep cleaning solution? Put it in the top rack of your dishwasher (without soap).
For storage, you can use the original packaging or a Ziploc bag. This just helps cut down the hair magnet problem.
Whipspider also suggests keeping the toy away from sharp items, as this could cause some tears in the silicone.
Be sure to only use water based lubricants with this plug.

Like with other Whipspider toys, this one came to me in a plastic bag with a paper insert. The paper insert has information on the Whipspider company and how to care for the silicone plug. The plastic bag can be used as storage, but mine easily ripped so it now rests in a similar Ziploc bag.
Obviously the packaging is not discreet as you can see the entire toy through the bag.