Roughneck Silicone Ring built for life! Hard working Americans across the nation are choosing this ring that is built for their tough lifestyles. 100% medical grade silicone! Perfect for work, gym and outdoor activities. Safety break under pressure, high temp tolerance, adjust to swelling, non conductive, hypo-allergenic and extremely comfortable! Sizing consistent with metal ring sizes. Half sizes should round up. Display includes sizes 9, 10 and 11.