The Vibrating Graduating Beads, made of Polyvinyl Chloride (PVC), start at 1/2" and grow to 1 1/4" in diameter. This toy should train and satisfy you anus. These are not any ordinary graduating beads though; they include a strong vibrating egg to send vibrations through the toy and throughout your ass. With an adjustable intensity for the vibrations and a graduating bead design this toy is a perfect fit, and delivers a perfect feeling.