The Tantus Fist Trainer mimics the natural shape of a closed hand and is the perfect way to prepare for or simulate fisting. The ribbed shaft adds pressure and releases crazy brain chemicals when removed. Shaft The Tantus Fist Trainer mimics the natural shape of a closed hand and is the perfect way to prepare for or simulate fisting. The ribbed shaft adds pressure and releases crazy brain chemicals when removed. Made of 100% Ultra-Premium Soft silicone, this is an advanced toy for people who know what they are doing and demand quality from products they put in their bodies.Harness Compatible: Yes Safe For Your Body: Made from Tantus’ own unique formula of 100% Ultra-Premium SiliconeEasy To Clean: Eco-Friendly, Hypoallergenic, Hygienic, Boilable, Bleachable and Dishwasher Safe.Shaft Diameter: 2" Max Head Diameter: 2.8" Length: 10" Weight: 1lb 5ozDiameter: 2". Length: 10".