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This innovative contra-rotating propeller system includes a large diameter front 4-blade propeller and small diameter rear 3-blade propeller that provides better acceleration and holding than the Quicksilver Thunderbolt BIII. The counter-rotating system also allows for unbelievable control of your boat, so you won't ever feel like you're not in control. This sleek prop comes in a tough matte finish. 15.9" diameter, 21" pitch, left-hand rotationStainless steel propellerUp to an 8% gain in acceleration versus the original Quicksilver Thunderbolt BIIIUnbelievable handling and boat control with contra-rotating propellersManufacturer part number 8M0123404