A colorful set of serger threads, durable. My family member stopped using their sewing machine, so I received these threads when they were going to throw them away. They say that 8 are non-stretch threads, and 2 are stretch threads. I'm not familiar with sewing machines, but from what I've heard, some machines require three threads of the same color. They also said that some machines can use two threads of the same color. Each set has two colors, but I wonder if they'll be useful... Please check the remaining thread amount in the photos. I looked at many other serger thread listings, and although some had a large quantity and seemed like a good deal, many had very little thread left, with only a small amount wound on the core, so please be careful. For those who enjoy handicrafts, or for those who find the colors they're looking for in this product, how about taking this opportunity? - Material: Polyester - Usage: Sewing machine thread Thank you for reading to the end. #SewingMachine #SergerThread [Aside ~ with ChatGPT] Question: Do serger threads need to be three of the same color? ChatGPT's reply: Good question! The conclusion is that it's not "absolutely necessary to have three of the same color." Serger machines generally use 3 or 4 threads, depending on the model. Cases where different colors are okay: * If the seams are not visible on the surface, slight color differences are not a problem. * For test sewing or basting, different colors are okay. Rather: * Use a different color for the looper thread. * Deliberately use different colors for design. Many people do this. Cases where the same color is better: * Clothing where the seams are visible (such as the hem of a knit top, ruffles, etc.) * When you want a neat finish like a ready-made product. * For thin fabrics where the thread color is likely to show through. If you're unsure, consider this: * Use colors close to the fabric for the two needle threads. * The looper thread can be a slightly different color. Serger threads surprisingly wear out unevenly, so you don't have to think "it's no good unless it's three of the same color."