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Pro-X Racing Valve Shim Refill Kit - 5 Piece 7.48mm x 1.55mm - 29.748155 feed-mpn-152380 2001 Polaris RMK 800 SPPro X Racing Valve Shim Refill Kit ProX valve shims are made of premium materials Specific heat treatment will ensure hardness of the shims to offer maximum durability and less wear Next to the specific heat treatment the shims are precision machined to match exact size The ProX valve shims refill kits come in specific sizes as quantities of 5 Product Details Tire Diameter Speed Rating Load Rating Wall Construction Tire Tube Type Rim Size Product Line