Ultra hygienic CyberGlass Cool Ice Mini Dong, Blue, 4" tall has a smooth, tapered shaft that can withstand reasonable drops and bangs and can conducts and maintains different temperatures without chipping or cracking. Has a concave, harness compatible base that can be used with Adam & Eve Signature Toys Head Gear Chin Strap-On, sold seperately. The Cool Ice Mini Dong becomes slick when lubricated and is easily cleaned by either boiling or being washed in the top rack of the dishwasher. Waterproof and phthalate free.