1.0 beads are 10mm, which is absolutely true. This is a well-known brand in the jewelry, jade and Wan Wen industries. Beads with a diameter of 1 cm are abbreviated as Ka 10, but actually are abbreviated as 10mm and 1.5 cm. Beads with a diameter of 1.8 cm are called Ka 18, that is, 18mm, and so on. This statement has become an unwritten term in the world of jade wares.