The pack of 10 SINGER Regular and Ball point Sewing Machine Needles is a great starter kit offering the beginner sewing enthusiast two standard types of needles in varied sizes. Ball point needles are best used on knit fabrics and regular point needles work best on woven fabrics. Machine needles are color coded to their sizes which include: 2 orange size 80/12 to use on lightweight fabrics 2 blue size 90/14 to use on medium weight fabrics and 1 purple size 100/16 to use on heavyweight fabrics in both universal and ball point machine needles. The 10 machine needles come in a convenient plastic transparent case with individual storage slots and sizes marked on the clear cover. SINGER sewing machine needles can be used on SINGER Brother Kenmore Bernina Janome Juki and other quality household domestic sewing machines. Domestic machines needles are not compatible with industry sewing machines.