These are 4x4mm cubes, but drilled from corner to opposite corner, making them 6mm long. Rhodonite, whose name is derived from the Greek word for Rose, "rhodon," is known for its pink, red and magenta hues. I thought that Rhodon was one of the Japanese monsters.
6mm x 4mm Approx. 52 on approx. 16 inch (40.64 cm) strand. (strand)