These premium clipper guards are made from fiberglass reinforced nylon for strength and durability. The metal clip firmly secures the clipper guard onto the blade and extra teeth help feed hair into the blade for a cleaner cut. The set includes 8 guards: #3 (3/8), #4 (1/2), #5 (5/8), #6 (3/4), #.5 (1/16), #1 (1/8), #1.5 (3/16) and #2 (1/4). These are compatible with all FX870, FX880, FX825, and FX673 models