Humm Dinger Double Dinger Cockring - Magenta Twice the hummer! Humm Dinger Double Dinger is made of stretchy jelly. The erection enhancer cockring fits around the base of the penis shaft. Two removable 1.125" x .5" bullets stimulate the testicles and clitoris. Each bullet has easy on-off control and lasts 40-plus minutes. Available in purple and magenta.