The Doc Johnson Glo Slim Anal Plug. Enjoy the new Glo butt plugs and light up your nights. These playful, glow-in-the-dark plugs measure 4.6 total length with 4 insertable and .9 in diameter, perfect for novice anal play. Non-Phthalate, Body-safe PVC material featuring our Antibacterial Sil-A-Gel formula. Proudly made in America.