TOP SEALING Silicone Core Acrylic Gland Packing STYLE 2600 is braided from high strength PAN synthetic fiber pre-impregnated with PTFE and Silicone Core, it is Composite braid, synthetic composite yarn braided around four equally silicone rubber cords, and impregnated with PTFE emulsion and special producing with lubricant. forming a packing that offers excellent resilience and wear resistance.