Found another source for the single-side zippered sleeves, which also had a little more info. The pic with the race gun is identical, so I am assuming that the product is the same but on this link, it is available in black only. The size is 9.5" x 14.0" which would fit perfectly in the main compartment of my Uncle Mike's Deluxe Range Bag (not that I have room for them).
On the other link, they are available in colors, which I think is a great idea. A different color could be used for each gun, giving instant identification of the contents without having to unzip each sleeve.
http://cedhk.com/show.php/Object385
Nick