The thickness of a GLARE grade does not need to be separately specified, because each pre-preg ply has a nominal thickness of , and the number of plies is already defined for a GLARE grade number. GLARE grades 1, 2, 3, and 6 have just two plies of glass fibers, so the thickness of an individual glass fiber layer is . GLARE4 has three plies, so its glass fiber layers are each thick. GLARE5 has four plies, with individual glass fiber layers of thickness. GLARE sheets have typical overall thicknesses between .