FILTERWEARS Pre-Filter K338K For K&N Air Filter RX-4730 Extends the life of any performance or exposed air filter, Protects against dirt & debris up to .005", Enhances filtration efficiency by keeping the air filter clean Hydrophobic technology repels water and prevents hydro lock washable and reusable Size: 5.0"T, 6.0"B, 6.5"H