Anal Training Butt Plugs Black. Set of 3 different sizes of butt plugs. As easy as one, two, three. Sized small, medium and large. Harness compatible. Suction cup on small flange base. Waterproof, non-vibrating butt plugs. Body safe RoHs compliant material PVC. Size Small butt plug 4 inches, Medium butt plug 5 inches, Large butt plug 6 inches.