10 White spools of High Quality Heavy Duty 3-PLY Polyester thread. These are slightly thicker than normal. All the spools are wrapped in clear plastic shrink wrap. It can be used on all regular sewing, piecing, applique, serger home and high speed commercial machines. This thread is also great for hand and machine quilting and since its made out of Polyester it has very high tensile strength and items sewed/quilted will last a long time for you to enjoy your Labour of Love.