Tenga FLEX Rocky BlackTENGA's latest malleable material has allowed them to create a brand new concept and sensation called the TENGA FLEX. This is the Rocky Black version of FLEX. The FLEX's spiral ribbed outer case creates a spinning stimulation . Simply cover the air hole at the top of the item after insertion and the FLEX will wind and unwind creating a spiraling movement as you stroke. Additionally the FLEX's malleable casing allows you to squeeze twist and grip the