This Shakers vol. 4 is an interesting idea for a person with a bio-penis who is looking for a hand-held device with a twist. Literally, a twist. In theory, the internal ridges and fins are supposed to stimulate the penis.

This is a toy for a guy to use when the usual stroking method is boring and is looking for a new grip on things.

Thermoplastic Elastomer is also called TPR. In this case, it's VERY sticky. It wasn't kinda sticky, it was really sticky. It was also about as tacky feeling as a lint roller. The outer tube is hard plastic. The inner tube is the TPR/TPE. It's limp and sticky.

Inside is a series of ridges that start out spaced apart and get progressively closer together. There are also fish fin shaped fans inside that are supposed to stimulate. The twist on the toy is that the last half of it spins 90 deg. on itself.

The dimensions of the interior of the toy are about average. The entrance is slightly agape, maybe a 1/4" hole. The design seems like a good idea, it didn't really work for me though.

The size/shape/color of the Shakers Vol. 4 makes it seem like a common thing; not quite describable, but not out of the ordinary (except for the stickers toward the top/middle).

This toy completely failed on me. The ridges didn't have immediate contact on me and the fins couldn't even be felt.

Full disclosure: I had a circumcision as an infant and my glans isn't as sensitive as a non-cropped penis. If your penis hasn't been clipped, you might get more enjoyment out of this.

The twist... um... twist is dependent on a piece of foam between the TPE sleeve and the plastic case. In the design, this provides the traction that lets the inside twist around the penis...but it doesn't. The styrofoam just slides around...going for a ride. This makes the TPE sleeve smoosh in on itself (maybe twisting, maybe not).

If you use this product more than once, you could turn it inside out and rinse it out with some soap and water. Check here for more info.

You can use both water and/or silicone lube with this.

The Shakers Vol. 4 came in a plastic box that fit the dimensions of the product perfectly. The instructions (in Japanese) were folded up on the bottom. It also came with a tube of lube. Thanks to another reviewer, I now have a way to describe this lube: Egg whites.

I'm just using the box now for a brief storage container. It seems to be keeping the egg white lube from leaking.

This toy was a total let down for me. It didn't stimulate me that much, the included lube was disgusting, and I couldn't read the instructions and had to let instincts kick in.

For a comparison to real life: it's like being the 3rd or 4th person to have a go with a receiving partner in a row.