10 Pcs, 45 mm Rotary Cutter Refill Blade, Comes in Case with bonus case for used blades. Sewing, Quilting, and Papercrafting. Compatible with Olfa, Fiskars and True Cut brands. 10 piece blades in plastic snap case with BONUS empty case for used blades! 45mm Rotary Cutter Refill Blades. Compatible with most major brands including Olfa, Clover, Dafa and Fiskars. Cuts up to 4 layers of fabric at a time. SKS-7 Steel material High Quality Sharp Blades