EYEFANCEE Aquarium Mesh Media Filter Bag Nylon Pond Mesh Filter Bag with Zipper White, 5 PCS VERSATILE MEDIA BAGS AS FILTERATION TOOLS: EYEFANCEE aquarium media filter bags are designed to hold bio-balls, activated carbon, ceramic and ammonia remover, preventing fines from being washed out, also preventing media from entering your filter system to make your pond clean. SPECIFICATION: The nylon media bag is sized to 15 x 20 cm (Approx. 6" x 8"), made of nylon and plastic. NOTES: as the hole of the nylon mesh filter bag is about 2x2mm, so the media filter bag can't hold 1x1mm media. Zipper closure for reusable purpose. EXTRA FUNCTION: The aquarium filter media bags are not only used as an application to keep your aquarium or pond tidy and clean, but could be your laundry bags or storage bags which are supposed to get your housework in order. PACKAGE CONTENT: including 5 aquarium media filter bags 100% SATISFACTION GUARANTEE: The aquarium media filter bags are guaranteed to meet your standards - or return it for a replacement or refund.