This is a great product for working with electronics. I have a workbench, but sometimes I have to solder at my desk. This protects the wooden surface of the table. It rolls easily into a tube about 2 inches in diameter. I made jump rings to hold the roll together when not in use. Small screw holes are good for very small screws, but also keep large screws from turning to some degree. Rectangular shells are suitable for components with small, straight leads, such as B. resistors and small capacitors. This is an item I wanted many years ago. I'll get some for my travel tool kit and for my workbench.