Doc Johnson Balls Deep 9â Stroker Reversible. Go Balls Deep with this 9â long Reversible Stroker! Featuring a unique texture on each side for two entirely different sensations, with an open-ended design for intense satisfaction. Made of UR3, the most lifelike material in the world, this stroker is a happy ending every time! Phthalate-Free, Body-safe, and Proudly Made in America.