The BASIX Universal Harness 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. Waist Straps are adjustable up to 40" and Thigh Straps adjust up to 24".