Pack of 10 Groz-Beckert Ball-Point Industrial Sewing Machine Needles. Needle System* : 135X17, DPX17 135X17 needles are also sold under these needle systems : DPX17, 135X17, 2167, SY3355, 335-03117 Ball Point (BP) (FFG/SES) needles are designed to alleviate making holes in knit or loosely woven materials. The cross fibers which constitute the knit or loosely woven materials are relatively far apart as compared to those in tightly woven material. When a needle with a standard "sharp" point encounters one of those fibers in penetrating the fabric, it cuts right through the fiber. This creates a hole in the fabric. The Ball Point needle pushes aside the fiber it encounters in penetration and thereby avoids making a damaging hole in the fabric.