Each bracelet is available in five feminine (3.5mm x 4mm) & one unisex color (6mm black & 6x9mm silver) combo. Bracelets wrap to comfortably fit all wrist sizes with no clasp needed. Letter spaces are the cubes, larger rounds are word spaces. Black neoprene (a non-latex rubber) spacers bracket the message Bracelets arrive carded with reading instructions & information on reverse side. Bracelets are nickel free. Not recommended for children under age 12.