Small size bobbin with 500M nylon thread Thread diameter: 0.1mm = 0.04" The nylon thread can be used as both top and bottom thread for sewing. It can make the quilting pattern looking more like a bas-relief. The nylon thread is smooth with uniform thickness to keep patchwork neat and tidy. Thanks to the clear invisible thread, the stitches on lace can be invisible too. It matches well with your colorful buttons and zippers. The nylon thread is soft but strong with low stretch, so it's also commonly used for beads sewing, to keep the sewing fastness and the harmony between the beads and fabric. Simthread Invisible Thread - 100 nylon, 500M / bobbin; diameter: 0.1mm, quite thin and low on stretch but high-strength. Clear Sewing Thread - Are you worrying about the thread color different from the fabric It will be solved with the invisible thread, that is great for sewing and quilting, especially for sewing laces and beads. Invisible Nylon Thread - Except sewing, it's also a ideal choice for beading works, such as pearls, transparent beads, millet beads jewelry, etc. Nylon Monofilament - Thanks to the strength, it's helpful for handing decorations for party, festivals and home garden.