MECHANICAL FILTRATION: The of filters socks IMPROVES WATER QUALITY by trapping debris, detritus, excess food, sand, coral and more HIGH QUALITY PROFESSIONAL GRADE: These filter socks are designed to be strdy, strong WATER: These 200 Micrometre felt filter socks trap smaller organic matter and debris larger or mesh filter socks do not catch to water REDUCES NOISE AND SPLASH in your aquarium/pond overflow system REUSABLE - 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:White Material:Non-woven + plastic Size:105 x 380mm Package Contents: 8 x aquarium filter bag Only the above package content, other products are not included. Note: Light and different displays may the color of the item in the a little different from the real thing. The measurement allowed error is +/- 1-3cm.