ROQ Silicone Wedding Ring Men Affordable Silicone Rubber Band, 7 Pack, 4 Pack & Singles - Camo, Metal Look Silver, Black, Grey, Light Grey PREMIUM MATERIAL. Medical grade, Hypoallergenic. OPTIMIZED DIMENSIONS. Width 8.7mm Thickness 2mm. LIFETIME WARRANTY. 100% Money Back Satisfaction Guarantee. SIZE: When self measuring, make sure the thread is tight on your finger. This is the only way to get the right size.