3mm square. Made in Germany - U.S. Zone and were commonly used by Frank Hess - Designer Extraordinaire (WW II Era) for the Miriam Haskell Collection!!! We found these and other sensational beads all in the same crate. This bead is seen in Cathy Gordon's book titled Miriam Haskell Jewelry. Sold in 12" strands of approximately 100 beads.