The Perfect Extension Harnessed extension. Perfect Extension 8 inches is made of soft rubber with a realistic look and feel. Straps help hold on the extension, designed to use with or without an erection. The rubber on these is about .25 inches thick. These extensions are 2 inches wide on the outside and about 1.5 inches wide on the inside. Length to insert the penis on the inside is 6 and 7/8 inches. Fits up to a 50 inches waist. Unisex toy. Easy to use. Plastic snaps. Just adjust to your waist size and click together. Belt like strap on harness.