... conditioner,dust treatment and so on . 1 polyurethane and polyester foam material . 2. reticulate,mesh,10ppi to 90ppi.3. good resilient ... keep the color for a long time 5. the filter foam is widely used in air conditioner,water pump ,water treament ... ,environment project.also could put carton particle in it absort special smell.6 .we can make them into any shape .7 ...