Use on aluminum & stainless steel marine tubing. These plastic clips are designed to make patterning easier and have no sharp corners which might tear fabric or paper patterns.
Olfa Deluxe Rotary Cutter is great for cutting cloth, paper, leather, vinyl, etc. Cuts forward, backward, around corners and even multiple layers of fabric!
This chalk is clay based and thus it is much easier to erase. Other chalks that are not clay based will leave a grease mark on cottons and other fabrics. Also works on glass vinyl.