The SINGER Assorted Denim Machine Needle 16pc Set is a great set of pre-selected SINGER machine needles ideal for general sewing on denim, jeans, and other heavy weight fabrics like leather, corduroy and upholstery. Assorted needle sizes allow you to choose the needle that best suits your fabric. The 10 piece SINGER Universal Regular Point Needles allow you to perform multiple standard stitching projects on woven fabrics. This set includes 4 orange size 80/12 needles best used on lightweight woven fabrics, 4 blue size 90/14 needles best used on medium weight woven fabrics, and 2 purple size 100/16 needles best used on heavyweight woven fabrics. The 5 piece SINGER Heavy Duty Needles are great for stitching heavy fabrics such as denim or leather. This set includes 2 purple size 100/16 needles for use on denim, 2 heavy duty 110/18 needles for use on heavy duty fabrics like upholstery and 1 blue size 90/14 needles for use on leather and vinyl. Finally, The 1 piece SINGER Twin Stretch Needle offers a smooth sewing experience while creating two rows of stitches simultaneously. The design creates decorative stitching and prevents skipped stitches when working with any denim with stretch or lighter weight denim.