These new masks are precision cut to fit popular high quality HO scale wheel sets. It not only keeps paint off of the wheel treads leaving just the front and back wheel faces and axle exposed for color, but keeps the modeler’s hands clean as well. The mask will hold four axles and, once painted, each of its “fingers” can be individually pulled apart to release one wheel set at a time. As paint builds up after time and since it’s made of acrylic, it can be soaked briefly in a number of paint solvents and wiped clean. Unlike cardboard masks, these will last for years! The mask is easy to assemble from 5 clear acrylic parts; a plastic solvent glue, such as Ambroid’s Pro Weld, is all that is required.