Designed to accommodate the needs and comfort for both personal and professional use. The handles are made of tough ABS plastic that gently forms around your fingers. Comfortable fit reduces pressure points and fatigue during extended use. Can handle the toughest material as well as the most delicate fabric. Feature Solingen steel cutting blades that are machine ground and hardened to 56 Rockwell. This specification is considered the optimal hardness of metal for maintaining a sharp edge. The blades are screw fastened and can easily be tightened to your personal preference.