The latest disc design. After the success of the Pro soft sonic disc we were inspired to make a disc with holes in it, to add a little bit of weight to it, and the result is the Pro Ultra Sonic disc. Easy to lift ofthe water due to the venting holes, while maintain the capability to create a vortex behind the disc, allowing soft modern materials to swim freely instead of collapsing in hard current. This is the future of modern fly design without a doubt! Comes in 15 colors and 3 sizes.