The 45mm skip rotary blade is made of SKS-7 steel, razor sharp and long lasting. Blade can be assembled to either side of rotary cutter for both left and right hand users. The SKS-7 steel blades are incredibly tough, resistant, and durable. Perfect for making skip cutting line on paper, fabric, film, leather, photo, vinyl, cloth, and so much more! 5pcs as 1 set in plastic case, now you can take your blades with you with the included carry case that will keep your blades safe and lubricated.