Advanced technology packing manufactured by combining four materials. The inner core is made of high resistance elastic materials surrounded by a structure of PHEN-TOP fibers with corners reinforced with high resistance Aramid yarn then fully lubricated by the impregnation of pure colloidal PTFE. This unique construction enables it to follow all shaft movement and the exceptional resilience and flexibility makes it ideal for use in pumps, mixers and reactors with large shaft sizes.