The PurMed Core 300 RF Replacement Filter is a high-quality pleated filter designed specifically for the Levoit Core 300 and 300S air purifiers. This filter has a MERV rating of 13, ensuring it effectively captures particles and allergens. Made with carbon filter media, this yellow filter in a package dimension of 8.19x7.76x6.38 inches is lightweight at 1.12 pounds, making it easy to install and replace. Purify your indoor air with this reliable and efficient air purifier replacement filter from PurMed. Pet Core Filter