The Annie Sloan stencils are 0.15mm thick and made from PET clear phthalate free plastic. Annie specifically chose clear plastic so that you can see exactly what you're stencilling over when you use them. It helps with creating repeating patterns and doing Annies signature random overlapping technique. Cleaning:the stencils are all washable. They are much easier to wash when the paint is still wet (i.e straight after use). Annie uses a damp sponge and warm soapy water. Stencils may get stained by the paint but this doesn't affect their future use.