Twist Anal Plug features deep sinuous swirls for extra stimulation. Easy to clean and fun to use, the Twist will be a terrific addition to your sex toy box. It has a maximum diameter of 1.3 inches and can be safely inserted up to 4 inches. Tantus Twist is a small butt plug made using medical-grade, platinum-based silicone. All Tantus sex toys are hypoallergenic, non-toxic, phthalate-free. Made to last a lifetime with minimal care.