Super elastic silicone rings. Six sizes for varied levels of climax control. Mini: 1.5 x 1.5 x 0.5 inch - 3.8 x 3.8 x 1.2cm Sm: 1.6 x 1.6 x 0.5 inch - 4.0 x 4.0 x 1.2cm Med: 1.9 x 1.9 x 0.5 inch - 4.8 x 4.8 x 1.2cm Lg: 2.2 x 2.2 x 0.6 inch - 5.6 x 5.6 x 1.5cm XL: 2.4 x 2.4 x 0.6 inch - 6.0 x 6.0 x 1.5cm XXL: 2.6 x 2.6 x 0.6 inch - 6.6 x 6.6 x 1.5cm