The M9 male masturbator is a realistic sleeve that is meant to fit most penis sizes. It has loops for finger placement and an extra loop for the bullet, included. The sleeve is textured internally and has rows of beads inside to create a decent suction with the toy. The toy is left open on both ends for easy clean up. The only down side is the lack of information about the material.
The material is listed as TPE, so it's one of those many variants of Elastomer.