1Universal Compatibility: Suitable for 15 to 18cc engines, the air filters set is designed to fit for HSP, for HPI, for Redcat and other brands of 1/10 RC gasoline cars. 2Strong Water Absorption: The sponge in the air filter has strong water absorption capabilities, keeping your RC car's engine safe from water damage during wet and rainy conditions. 3Enhanced Performance: By providing clean and filtered air to the engine, this air filter helps maintain optimal fuel combustion, resulting in improved performance and power output for your RC car. 4Durable Rubber Material: Made with premium rubber material, the RC air filter is designed to withstand the rigors of RC car racing and offer long lasting performance. 5Convenient Disassembly: The air filter is easy to disassemble and replace, simply remove old parts and put this new one in its place, convenient for daily maintenance.