Pure silicone anal training kit with Satin Finish Designed for comfort and extended wear 3 graduated sizes tapered for a perfect fit Flanged base with gem inlay Smooth and seamless Hygienically superior and body safeDimensions:Small Probe: 2.5 x 1 in.Medium Probe: 3 x 1.25 in.Large Probe: 3.5 x 1.75 in.