Basix Rubber Works Universal Harness Plus Size. The Basix Universal Harness is available in Regular and Plus-Size and includes 3 silicone rings. Each sold separately. Easy to adjust and fun to use for sexy strap-on play. Most of the Basix dildos are Strap-On ready and Harness Compatible. Includes small 1.2 inches, Medium 1.6 inches and Large 2 inches. Silicone rings. Material: PVC. Country of origin China. Basix Universal Harness is featured in Pipedream Products 2012 Basix, page 6. Shown with dildo. Dildo not included. Sold separately.