Dr. Joel Kaplan Reversible Masturbator Sleeve is like having two different male masturbation devices in one. One side is smooth and the other side has textured tickler ribs on the entire surface. Endorsed by Dr. Joel Kaplan. Super stretchy, soft, and tight masturbator reverses for ridges or nodules. Made using phthalate free, non-toxic materials Thermoplastic Elastomers TPE. Stroker measures 5 inches long by 1.75 inches wide.