Tom Of Finland 3 Piece Cock Ring Set Silicone. This 3 piece silicone cock ring set has triple the size options. with a premium material for longer lasting erection support. The smooth silicone is rigid yet flexible. with a matte finish and raised Tom of Finland logo on the outside. Comes in 3 graduated sizes. which you can wear alone or combine for maximum erection enhancement. Measurements rings 1.5 inches. 1.75 inches. and 2 inches in diameter. Material Silicone. Color Black.