More is More with Tantus XL toys. The Fido creates a unique anal experience unlike any other! The middle knot acts as a plug releasing mind boggling pressure, when inserted in and pulled out. The ribbing on the upper shaft stimulates the inner anal muscle band, and combined with the sensation of the knot, creates an intense experience for the advanced player. This is an advanced toy for people who know what they are doing and demand quality from products they put in their bodies. Easy to clean and store. UNIQUE ANAL EXPERIENCE: The Fido creates a unique anal experience unlike any other! The middle knot acts as a plug that releases an amazing pressure when inserted and pulled out. The ribbing on the upper shaft stimulates the inner anal muscle band, and when combined with the sensation of the knot, creates an amazing experience. SIZE MATTERS: Top Tip Diameter: 1.8", Ribbed Shaft Diameter: 1.6", Middle Ball Diameter: 2.5", Bottom Shaft Diameter: 1.3", Base Diameter: 2.8", Insertable Length: 9", Weight: 15 oz HARNESS COMPATIBLE: Yes, with o-ring style harnesses. Fold-down the base to put the ring around the bottom shaft. SAFE FOR YOUR BODY: Made from Tantus'' own unique formula of 100% Ultra-Premium Silicone EASY TO CLEAN: Hypoallergenic, Hygienic, Boilable, Bleachable and Dishwasher Safe.