Metal mezuzah case, 7 CM
7 different colors:
Z-700 (MATTE SILVER), Z-701 (GOLD), Z-702 (DK. BROWN), Z-703 (WHITE), Z-704 (IVORY), Z-705(LIGHT BROWN) and Z-706(SHINY SILVER).
also available in 10 and 12 CM, and with or without nails. 
see attached picture