I buy cones of 50 wt. cotton Presencia thread for piecing. It lasts forever and it's thin and strong. You don't need a big hole in your needle. Your fabric lays flatter, and if you do a 1/4" seam, it is a true 1/4" seam because of the thinness of the thread. Lotss of spools are 40 wt. which is thicker and needs bigger hole in needle and fabric doesn't lay as flat and not as true a 1/4" seam. JMHO.