Coarse and Medium foams. Profile cut for maximum surface area which ensures that maintenance intervals are kept to a minimum and suspended particles are removed most efficiently. Much more effective than standard flat foams as they provide cavities for better settlement of dirt when stacked on top of each other. 

11" x 17" x 1" (430mm x 280mm x 25mm) 

Coarse foam is approx. 15ppi and medium foam is approx. 30ppi