Sharps are perfect for sewing fabric of standard thickness. Use size 7 for wool, hemp and cotton fabric, size 8 for thin wool and cotton and size 9 for silk and thin cotton fabric. Sizes: #7 (0.69mm x 39mm), 8 needles #8 (0.61mm x 36mm), 8 needles #9 (0.53m x 33mm), 8 needles Asst #7-9: 2 size #7, 3 size #8, 3 size #9 needles