Star of David (Magen David) Silver pendant - Magen David, means literally the Shield of David.

Available in five heights (inches approximate):

X-Small - 3/8 inch /1.1 cm 

Small - 1/2 inch / 1.5 cm

Medium - 3/4 inch / 1.8 cm

Large - 1 inch / 2.5 cm

X-Large - 1 1/4 inch / 2.8cm