Engineered for maximum horsepower and protection custom designed to each air box and filter cage for best fitment and performance dual-stage foam traps even the smallest dust or dirt particles flexible glue is used on all seams to prevent cracking and extend filter life super seal neoprene and foam base eliminates the need for grease and creates the best filter-to-airbox seal on the market used by factory teams around the world handmade in the u.s.a.