Ass Ballz is a backdoor favorite. The heavy Baller is 100% Medical Grade, high end silicone with no filler. The seamless, matte surface has a soft touch silicone finish. Each of the 4 ion balls are 1.6 (4cm) with 1.6 (4cm) length of durable silicone between each. The Baller is extremely pliable and has a ringed handle for a secure grip and easy manipulation.