Combination Graphite Packing Systems Packing systems using A.P. Services Style 5000 Braided Yarn and 6300 Die-Formed Flexible Graphite are designed to provide optimal sealing and low friction. A.P. Services Style 5005 standard Grade Graphite Bushing and A.P. Services Style 5010 High Density Graphite Bushing are designed to improve packing performance by reducing the weight of the packing and also align the valve stem.