Anchor base for increased stability and comfort! Only 1.5in. at its largest diameter. this plug is a good beginner toy. The Ryder has a gradual curve from the body to the neck of the plug. which means it wonft.t shock the sphincter muscles going in or coming out. Harness Compatible: Yes Safe For Your Body: Made from Tantus’ own unique formula of 100% Ultra-Premium Silicone Easy To Clean: Eco-Friendly. Hypoallergenic. Hygienic. Boilable. Bleachable and Dishwasher Safe. Diameter: 1.5in. Length: 4.6in.