Stencils are cut from clear plastic sheets that are 6 Mil thick and acid free to prevent damage to projects. Making them flexible to also use on some cylinder shapes and see through to help keep on point of projects. You can use adhesive to hold them in place when needed. They are very light weight/thin, washable, reusable, and flexible. Stencils are cut with a cutting machine not a laser cutter. Stencil shown in negative form so image will stand out better, making the dark part the stencil and the white parts what is cut out. Sometimes there is some residue left over from the adhesiveused to hold the plastic down while being cut, but it can be cleaned off with some soap and water.