External texture:
Super-soft silicone feels supple, malleable, and giving, and warms quickly to the touch. The ridged, slightly turned structures on the outside help with grip, but ultimately this thing is softer in the hands than most masturbators, so no chance of losing one's grip.
Stroke-length/Depth:
As a gentleman who is lucky in both girth and length, I often have issues with masturbators, either being too tight, too short, or both. This toy has about 6 inches of penetrable depth and two openings, one about 1 inch in diameter and one significantly smaller. I popped in through the larger opening (about 1 inch in diameter), which was snug but not overly tight. And because the silicone is super-soft and giving, it accommodated my girth easily.
As for my length; at the deepest stroke, I popped out of the small hole at the other end, and was very surprised that even the smaller hole stretched to accommodate me. In fact, the change in tightness was a new sensation right at the end of the stroke, which was amazing!
Internal textures:
There are two discernible textures within; dots, and ridges.
The dots begin nearest the larger opening, and ridges at the other end. Both feel amazing, but the texture change right in the middle, where it switches from one to the other, is just spectacular to feel.
All told, I'd say this rivals, if not beats, even more expensive masturbators, and I'll not hesitate to buy another once I've worn this one out.