Industrial Serger Thread, Size 90, 18 Spools, and 20 Others Combined Set of 38 Spools (A) These are leftover threads from a sewing factory. The quality is better than general-purpose thread, and the spools are larger with several times the amount of thread, so they last a long time. Can also be used with home sewing machines. Size 90 serger thread can be used as is. If the spool doesn't fit, you may need to wind it onto bobbins. The same applies to sizes 50 and 30 (I use bobbins). ⭐︎ Serger Thread, Size 90: 18 spools ⭐︎ General Fabric to Slightly Thin Fabric, Size 50: 12 spools ⭐︎ Thick Fabric, Denim, Size 30: 8 spools ⭐︎ Total: 38 spools These are factory leftovers, used items. There may be some dirt or dust. Please understand that these are not new before purchasing.