This document specifies the classification, requirements, inspection rules and marking, packaging, transportation and storage of polyurethane bundled microfiber synthetic leather for automobile steering wheels, and describes the corresponding test methods. This document is applicable to polyurethane bundles for automobile steering wheels made with non-woven fabrics made of sea-island composite fibers as the base, impregnated with polyurethane resin, wet solidification, weight reduction treatment, post-finishing and dry veneer. Production, inspection and sales of microfiber synthetic leather.