KISSWILL rotary cutter blades 45mm compatible with all Fiskars 45mm rotary cutters. If they don?t fit yours, return them for a full refund without any reason. Perfect rotary blades 45mm for quilting, sewing, arts&crafts: Ideal for cutting multiple layers of fabric, fleece, felt, leather, cardboard, wallpaper, vinyl and other DIY Projects. High Quility and Sharp: Made from Japanese Steel (SKS-7) that stay sharper longer, the blades go through 4 individual sharpening stages that stay sharper. Cleanly slices through 10 layers of fabric at once. Ultra Durable: Tungsten alloy adds strength and wear-resistance, while lubricants and specialty storage case keep them in optimum condition until you?re ready to use them. 100% Money Back Guarantee: If you feel the rotary blade Not Sharp enough or Not Cleanly cut, or you feel that our blades don?t exceed your expectations, please return for a full refund.