Double filtration ------ The filter is composed of 2 layers, which doubles the filtration efficiency. for sport air filter High quality stainless steel------The plate and net are made of high quality stainless steel, which can prevent rusting in cold air or high humidity. For car sport air filter, auto tuning air filter Improve performance: Designed to improve throttle response and increase performance. Improve your vehicle's performance. For tuning air filter Reusable ------ Micro gauze type filter material, which can be washed with water or soap can be reused. Equipped with adjustable clamps for easy installation. For motorcycle air filter Scope of application: ideal for heavily modified or turbocharged vehicles that can produce higher airflow. It is ideal for placing filters in cars with limited space. For mushroom air filter, sports car air filter