JConcepts Masking Tape. This premium masking tape offers a great solution for any hobbyist looking to perform simple paint schemes with multiple colors with crisp lines and color separation. Available in multiple sizes the narrower, 12mm x 50m length roll is great for performing detail work, slight curvature to mockup a design to the inside of a body shell of choice. The wider, 24mm x 18m roll is good for masking off larger areas or to quickly cover more space. Package includes one roll of tape.