EXCELLENT MECHANICAL FILTRATION: The use of filters socks IMPROVES WATER QUALITY by trapping debris, detritus, excess food, sand, coral and moreHIGH QUALITY PROFESSIONAL GRADE: These filter socks are designed to be strdy, strongCRYSTAL CLEAR WATER: These 200 Micrometre felt filter socks trap smaller organic matter and debris that larger or mesh filter socks do not catch to provide crystal clear waterREDUCES NOISE AND SPLASH in your aquarium/pond overflow sump systemREUSABLE - These unique mesh filter bags are EASY TO FILL AND EMPTY with top zipper design to keep filter media secure. Our bags are durable, washable, and can be reused.Colour:WhiteMaterial:Non-woven + plasticSize: 105 x 380mmPackage Contents:12 x aquarium filter bagOnly the above package content, other products are not included.Note: Light and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.