Using this cardboard cutter is a breeze. To start cutting, simply extend the blade and you're ready to go. You can cut cardboard upwards or downwards thanks to the serrated double - edge blade. For opening boxes, use the blade to slice through the tape easily. When building cardboard forts, it can make precise cuts to shape the cardboard as you like. To make circular cuts, just guide the cutter carefully along the desired path. The round chisel - edged tip is handy for peeling labels off. First, insert the tip under the label's edge and gently lift. You can also use it to score materials or make shallow cuts. Always keep this product away from children as it's not a toy. After use, retract the blade to avoid any accidental cuts. To maintain it, wipe the blade clean to keep the non - stick coating effective. If the blade gets dull over time, you can replace the PS blades.