The filter media bags are unverottbare white polyester bag designed for use in both freshwater and saltwater aquariums. They correspond to the Oeko Tex Standard 100 This mesh bag or filter socks are eg the respective filter medium Filter carbon, activated carbon, black peat granules, peat fibers, exchange granules, phosphate, etc. Further, Enter filled and are repeatedly re-usable. Material filter bag: 100% Polyester Ökotexstandard-100 No.: Z1.0.7578 Stretched length: 15 cm Stretched wide: 5 cm Water permeability in l / m sec: 400 Stretched diameter in mm: 405 Tensile strength in the longitudinal N / m: 480 Transverse tensile strength in N / m: 515 Tensile Elongation along in%: 45 Tensile Elongation% in transverse: 68 Puncture force in N: 150 Shipping: by DHL when package