Oval Plugging Dams by Innovative Bowling 24 Discs per box with each Disc having 6 detachable Rings.
Traditional oval plugging dams have at most 4 usable rings per disc (the smallest oval is possibly usable but probably not). By adding two more rings to the outside, we have increased the usable material by nearly 50%. The two outer rings also provide for larger hole diameters that may be plugged.
