... 2.corrosion resistance 3.high efficient filter 4.use: clean/ filter filter sponge Factory directly sell,low price,good ... size,packing ,colour can according to your request.filter sponge 1) Material: PU sponge,10ppi,15ppi,20ppi ... We are committed to do the following service1,Sample time: 3 days2,Delivery time:7-10days after ... Port: Shanghai3,One-stop service:from sample to production,then to shipping.