High density filter bags with high particle removal efficiency. Fit most major competitive filter housings. Provide best positive sealing when used in APM bag filter vessels. Material selections: Polyester, Polypropylene, Monofilament Nylon, PTFE. Collar style: Plastic or stainless steel ring. Four standard sizes available: NO. 1 - 7x16, NO. 2 - 7x32, NO. 3 - 4x9, NO. 4 - 4x15. Custom design, size and shape available upon request.