Pack of 50 Assorted Size Needles Compatible with Juki Industrial Single Needle Sewing Machines. Needle System: DBX1 Equivalent needle system: 16X231, 16X257, 1738, 1738A This assorted pack contains below sizes. 10-needles per each size. Total of 50 needles. Size 65/9 - used on sheer to lightweight fabrics Size 75/11 - used on light to medium weight fabrics Size 90/14 - used on medium weight fabrics Size 100/16 - used on medium to medium-heavy weight fabrics Size 110/18 - used on medium-heavy to heavy weight fabrics Lower size numbers are narrower or thinner needles used for lighter materials. Higher size numbers indicate a needle of thicker diameter, used for heavier materials. Compatible with Juki models : DDL-201, DDL-227, DDL-555, DDL-5530, DDL-5550, DDL-8300, DDL-8500, DDL-8700, DDL-8900, DDL-9000, DLN415, DLU5490, LZ-271, LZ-391N, MBH-180