The BASIX Rubber Works 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 inches) Medium (1.6 inches) and Large (2 inches) Silicone rings. Phthalates free and made of PVC. Dildo not included.