A short note describing X-ray photographs of two balls of linen thread in the Metropolitan Museum of Art, dated to about 1200-1000 B.C. (Twentieth to Twenty-second Dynasties). The X-rays show that the Egyptians wound thread around small pottery fragments used as cores. The author notes similar worked potsherds found without thread at Lisht, and a thumb-hole in the smaller ball. A plate of six photographs shows the balls and their X-rays.