The perfect accessory for solo play! It is compatible with all Tantus vibrator toys and any toy that accepts a bullet vibrator. Try it on the wall, in the shower, or on any other of your favorite smooth surfaces. Tantus' 100% Ultra-Premium Silicone is hypoallergenic, hygienic, phthalate free, boilable, bleachable, easy to clean, and non-toxic. The suction is superb and the shaft's largest diameter is .75". With minimal care, a Tantus toy can last a lifetime. Experience the science of sensation!