The O2 Mark is made of two types of premium silicone with a softer outer layer covering a firmer inner layer. This is a rather realistic dildo--in fact, I just Googled penis photos to help me judge whether the veining was too exaggerated because I've had more contact with vaginas than penises in the last few years, and I found a photo in the top results that could have been the model for this one. It even has a tiny little cum hole.

You can definitely use this for gender play, and even pack with it if you want to go for the erect look.

The material is heavenly. It's delicately, squishy soft on the outside, but firm on the inside, making it fun to hold and play with. It doesn't quite feel exactly like an erect penis, but it's the closest I've ever felt a dildo come to.

The velvety outer silicone will pick up lots of lint and hair that will stick to it, so store it in a bag. The silicone on this one is of prime quality because it's a Tantus toy, so of course it's odorless.

Beginners will enjoy this because of it's non-threatening size, but my very own experienced size queen loved it because it hit her just right in the G-spot. She said that the rim of the head hit her just right. Although she loves to take big ones, she felt that this average dildo felt "just right". I have yet to try it myself, but it looks like one that would be right up my ally. She usually asks me to tilt dildos up, but this one hit her so right, that she told me to keep it in a more regular (and less wrist-straining for me) position. This probably has a lot to do with her own anatomy, but I think everyone would enjoy the feel of the soft-but-firm texture and ridged head and raised veins.

It's a little over 6 inches long, and 5 1/2 inches insertable.

Its performance really has no downside. It's a little too short for me personally to use very effectively for missionary, but wonderful for girl-on-top and hand-held action.

You can use the base as a handle, or use it in a harness. In an ideal world, the base would be a tad thinner and wider, so as not to slip out of a large O-ring. But with a snugly fit O-ring, you'll be fine.

This premium silicone dildo can be sterilized in the top rack of your dishwasher, or by boiling, or by washing with a 10% bleach/water solution. Lint sticks to it easily, so store in a bag.

Packaging is nice but meant to be thrown away.