The Surenda from Nasstoys. 10 Function bullet,100% Silicone,3 interchangeable sleeves: Finger Sleeve, Twisty Sleeve, Nubby Sleeve Waterproof,Phthalates free,Materials: Sleeves-Silicone, Bullet-ABS Sizes: Nubby Sleeve-3â  , Twisty Sleeve-3â  , Finger Sleeve-2.125â  , Bullet Length-2.375â  , Bullet Width-0.75â  , Bullet Circumference-2.5â   3 LR44 (AG13) batteries included.