Premier's PolyBoard was the original unbreakable paper trimmer, with a lifetime warranty and virtually indestructible PolyBoard base that never warps, cracks or peels - guaranteed. Available in 12", 15" and 18" versions, PolyBoard trimmers cut up to 10 sheets of paper, or cut cardboard, matte board, film, tissue and textiles. Super-hardened steel blades actually sharpen themselves as you cut. Adjustable paper guide simplifies aligning repeat cuts. Half-inch machined alignment grid on trimmer base can't wear out like painted grids do. Safety blade brake, safety finger guard and convenient blade latch. English and metric scales. Made in USA.