C&C has many different types of thread. Some are not to be used on a sewing machine. If the store does not have the chart posted what each spool number contains then you don't know what you are buying. The 100% cotton machine quilting thread on the large no show spool is thick thread, not for piecing at all. Hand quilting thread is not to be used on any machine, the glaze will build up on the tension disc. The thread on the small spools are different then the thread on the larger spools. Way to confusing for one thread display rack.