... low price,good quality, size,packing ,colour can according to your request. aquarium filter sponge1) Material: sponge(PU).It have 10ppi,15ppi,20ppi ... ,25ppi,30ppi,etc.2) Usage:used to filtering or clean ... sample to production,then to shipping.4,Payment terms:30% T/T, 70% balance T/T against the copy of B/L. aquarium filter ...