Olympus crochet threads are made in Japan from the highest quality cotton and are availbale in a variety of colours. The weight of the ball is 10g and the thread is 89m in length. The composition is 100% cotton and they are suitable for Japanese crochet hooks sizes 6-8. Length: 89m (97 yards)Weight of Ball:10g (0.35 ounces)100% Mercerised Cotton Japanese Crochet Hook 6-8 minimum 1 box