Go far and beyond with the clear 32mm size Zizi Black Hole Tunnel. When you look at the Black Hole Tunnel, the first thing you will notice is the shape - it has an added twist that will make your trip well worth your while. Hollow on the inside and open from end to end. Made from TPR, body safe and hypo allergenic. Size is Inside Diameter 32mm, Outside Diameter 58mm, Insertable length 80mm.