The fully automatic blade retraction on safety knives offers you high protection against injuries. This also works when the user is still holding the slider. The blade is always retracted fully automatically into the handle after the cutting process as soon as it leaves the material to be cut. Another way to increase safety is to use ceramic blades. These have a special grind that allows you to cut almost all packaging, but almost not into your skin. Knives with fixed blades, manual or automatic blade retraction can also be "upgraded" in this way.