They have a transparent front and a transparent back of the insert. FOLLOW THE INSTRUCTIONS CAREFULLY. It's not exactly the process I expected, but it turned out great! Separate the letters/numbers you want to use and use the clear plastic front and back to align the numbers evenly. (I used to use large boxed business numbers, rigid, with adhesive backing and metallic reflective backgrounds. They were chunky and industrial looking. They look much better, almost like they were painted by a professional sign artist.) I bought the white color for shipping black metal box. Contains 2 sentences in 2 full alphanumeric sentence sizes. If you place the same characters in more than one spot, or need 2 or 3 of the same character, count and get an extra set or more, even if it's a joke or change of plan. It's pretty frugal. The only "hard part" was trying to get the release sponsor finicky to start working when he got ripped off. Once the sticky side is open, be sure to smooth it down from end to end using the small pressure card provided to remove any bubbles. Once it fell, it REALLY got stuck. But a little patience will pay off with great work.
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