The fine point of this blade refill cuts paper, plastic, balsa and bass wood. It is precision-crafted of the highest quality carbon and stainless steel with hard sharp points and finely honed cutting edges. Blades provide superior sharpness and extended life. Each blade is blue oxidized to increase durability and prevent rust. Blade refill for Type A handles is ideal for delicate, precision cutting, detailing, trimming and stripping.