This pair of black Cutting Pads was specially designed for use in the Sidekick machine. Constructed of high-quality polycarbonate plastic, these see-through Cutting Pads allow for easy die-cutting Sizzix chemically etched wafer-thin dies (Thinlits, Framelits and Triplits) in the Sidekick machine. Simply sandwich the die and material to be cut between the Cutting Pads and roll through the machine. Each Cutting Pad measures 4 7/8" x 2 1/2" x 1/8" and lasts for thousands of cuts. All Sizzix Cutting Pads are meant to be used on both sides. When both sides of the Cutting Pads are worn out, it is time for replacement Cutting Pads.