NT Cutter 45-Degree blades for Art Knife and Circle Cutter, 40-Blade/Pack, 1 Pack (BDA-200P) Blades for Art knives and circle cutters 4mm W x 21mm L x 0.38mm T 45 degree blades Made of high quality carbon tool steel Packed in hanging plastic container Cutting Material: Paper, card stock, any other thin material 40ea per pack Made in Japan