FIDO is made from our signature FLEX-TPR and is designed to mold to your dick like a second skin, transforming it into the ultimate pup pucker stuffer. Coat the inside with lube, pop your meat in the sheath, pull your nuts through the sling, and youre ready to pound a puppy! If you want a tighter fit or more suction grip, FIDO comes with a nub insert that is designed to lock into the hollow chamber to shorten the inner length . FLEX-TPR safe, non-toxicand phthalate free