Magnetic tapes of any dimension are easy to cut with scissors or any other type of cutting tool. This means you can cut a 30 metre roll into the exact length required for your project, such as the four sides of a window frame, for instance. Alternatively you can purchase pre-cut lengths of magnetic tape or sheeting that are 1 metre long or in multiples of 1 metre. In many cases it is easier to join the A and B tapes together with the magnetic sides and then cut them to length you require simultaneously.