Windsor Replacement 5301ER Micro Filter only at Onlinevacshop with free shipping available on most items plus huge volume discounts. Envirocare vacuum cleaner filters are designed and developed in the USA but made in China. Envirocare technologies make HEPA filters with odor neutralizing activated charcoal. Envirocare makes a wide range of replacement vacuum filters. With over 300 different items to choose from Envirocare brand vacuum filters should be your number one choice. this item has a SKU# INT243 and can be searched using this number.