*Nusach Bais Yosef - size 12 cm, 5 inches. 
*Written by a certified and reliable scribe on shlil parchment.
*The mezuzah comes with certification of "Hagaha" (Certified scribe who checks the mezuzah word by word) and "Computer Check" (Hi-teck software that checks the mezuzah for missing and extra letters), with a guarantee.