THE LASSO: The soft silicone cord is fully adjustable to fit everyone with the Secur-Lok system, making it easy to tighten or loosen. Dura Technology made-to-fit materials not only stand the test of time but also stand the wear and tear. Rock Solid cock rings combine quality and comfort for your best performance. • fully adjustable to fit everyone • compatible with silicone personal lubricants • easy to clean with soap and water.