Schmetz 705 HDK Quick Threading Needles are universal needles with a small slit in the eye of the needle for threading effortlessly. These needles are beneficial for people who have difficulty threading their needles, such as those with vision problems, children, or trouble with fine motor coordination from arthritis. Quick Threading Needles, formerly known as self-threading or handicap needles, are not for use with sensitive fabrics, for example, silk, microfiber, or batting, as they may cause pulled threads. Due to the structure of these needles, they are not sturdy enough for sewing denim. Schmetz HDK Quick Threading Needles work in machines that use the 130/705H system needles. Most Schmetz Needles include two color-coded bands just below the shank. The top color indicates the type of needle, and the lower color indicates the size. The Schmetz Quick Threading Needles do not have a color code. Schmetz 705 HDK Quick Threading Needles is a pack of five needles in a plastic case that slides shut for safe storage. The needle system, needle type, and needle size are printed on the front of the case. Size & Color Guide: Size 80/12 - Orange Size 90/14 - Blue Needle and Fabric Recommendations: Size 80/12 Chambray Corduroy Woven Bed-Linen Woven Cotton Double-Face Woven Felt Flannel Fleece Fun Fur Jacquard Thin Leather Linen & Half-Linen Loden Nettle Nylon Polyester Terry Cloth Thermovelour Fleece Tulle Velour Velvet Viscose Wool & Wool Blends Size 90/14 Woven Bed-Linen Chambray Chenille Corduroy Woven Cotton Felt Flannel Fleece Fun Fur Jacquard Thin Leather Linen & Half-Linen Loden Nylon Polyester Terry Cloth Thermovelour Fleece Tulle Velour Velvet Wool & Wool Blends