Stack it cock ring blueel stack it, made of silaskin material, is a compact and extremely comfortable cock ring, which is perfect to wear in the game or to show your bulge under clothing. You will not be able to compare this with other ring manufacturers. This is a premium product with an ultra smooth feel. so soft, designed to wear for sexy fun. Fold more for more tightness. stack it is stackable use a few or a lot to get more restrictions. ultra soft ideal for the testicles or penis.