Warp knitting continues to expand into the industrial fabric sector, and warp knitting machine manufacturers continue to develop new apparel fabric knitting machines. Karl Mayer's HKS 2-3 (E) and HKS 2-3 two guide bar knitting machines knit super light weight fine gage fabrics. Industrial fabric knitting machines use monoaxial, biaxial, and multiaxial weft insertion designs. Warp knit spacer fabrics offer the option of differing surface properties on the face and back fabric surfaces and spun or filament yarns between the fabric surfaces. Liba's HS ST and Racop DS tricot knitting machines feature a magazine weft insertion system. Comez and Valentine Rius Capers SA manufacture crochet machines for manufacturing narrow fabrics.