The back of each mask is primered and then painted gloss black. (see below)
Each mask is a little over 1/16th of an inch thick. (see below)
Each hole is individually sanded from the front for a smooth shape. (see below)
Each hole is also individually sanded/tapered from the back, and this serves two purposes.  1) It gives the appearance that the mask is thinner then it is.  2) It provides better breathing ventilation/air movement when the mask is being worn. (see below)
Here is a list of each masks measurements in inches, width and length, from the back of the mask.  (measurements may differ slightly from mask to mask).

Shelly -   7 3/8 X 10 1/8
3 -   7 7/8 X 10 1/8
Brooker  -   7 1/4 X 10 1/8          
4 -   7 7/8 X 10 1/8
5 -   8 3/16 X 9 15/16
6 -   8 1/4 X 9 15/16
6 version 2 -   9 1/2 X 9
7 -   7 3/8 X 9 1/8
8 -   8 1/4 X 9 3/4
8 version 3 -   9 1/2 X 9
9 -   7 X 8 5/8
X -   6 7/8 X 8 1/2
Trioxin245 X  -   7 1/4 X 9 1/2
Uber X -   6 3/4 X 10
Vs -   8 1/4 X 9 7/8
Vs Kirzinger -   7 1/2 X 9 1/4
Vs battle -   7 1/8 X 10 1/8
Remake -   7 3/8 X 9 3/4
War hock -   7 3/8 X 10
Fibrosport Small -     6 3/8 X 9 5/16
Fibrosport Medium -   7 X 9 15/16
Fibrosport Large -   6 11/16 X 10 1/2
Customs -   7 7/8 X 10 1/8
Please stop me - 8 1/4 X 9 3/4


Most of our masks can be dated by the color of the signature on the back.
Here are some samples by year...
2004




2007- 2011
2005




2006
2012