These standard blades with a diameter of 45 mm have been specially designed for the prym.ergonomics rotary cutter, and with regard to shape and function form a perfectly coordinated system. Although the blades are extremely sharp, they can be changed with ease, because, right from the moment you remove them from the packaging up until you fit them to the rotary cutter, the blades are safely protected. A high-quality plastic protective cover allows you to change the blade safely without directly touching the blade. When the rotary cutter is not in use, the blade guard ensures that the cutter can be safely locked. The safely packaged blades should be changed regularly, because blunt blades lead to fatigue, inaccurate cutting and damage to the cutting mat. The standard spare blade has a light green blade guard.