Tantus'' Silicone O-Ring Harness Set is compatible with any harness that takes an O-Ring. Set includes six different sizes to accommodate your Tantus Toy of choice. Diameter smallest to largest: 1.2" / 1.48" / 1.74" / 1.97" / 2.22" / 2.5" SET INCLUDES: Tantus'' Silicone O-Ring Harness Set is compatible with any harness that takes an O-Ring. Set includes six different sizes to accommodate your Tantus Toy of choice. SIZE MATTERS: Diameter smallest to largest: 1.2", 1.48", 1.74", 1.97", 2.22", 2.5" WARNING: Do not use O-Rings on penis, this is for toy use only. 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.