TOP SEALING Silicone Core Acrylic Gland Packing STYLE 2600 is meticulously crafted from high-strength PAN synthetic fibers, pre-impregnated with PTFE and encased within a Silicone Core. This composite braid features a synthetic composite yarn intricately woven around four equally spaced silicone rubber cords. The packing is further enhanced with an infusion of PTFE emulsion and a special lubricant, resulting in a product that boasts exceptional resilience and wear resistance.