The BASIX Universal Harness is available in Regular and Plus-Size and includes 3 silicone rings. Easy to adjust and fun to use for sexy strap-on play. Most of our BASIX dildos are Strap-On ready and Harness Compatible. Includes small (1.2") Medium (1.6") and Large (2") Silicone rings. Materials: PVC/Silicone, Size: (Rings) S 30mm- M 41mm- L 51mm, Power: None Required