Photos above were taken of both the front and back of these pendant although they look identical.  

The two blue pendants are slightly different sizes.  One is 57 x 28mm and the other one is 54 x 29mm.  Both have sizeable holes down the center of the length.

The green pendant is 55 x 28mm with the hole down the center of the length.

The beige pendant is shorter at 53 x 32mm with the hole down the center of the length.

Colors in the photos above are a good representation of the actual.