The Sticky Block is optional, you can pick and press each letters individually, but the Sticky Block ensures an even emboss and more control over placement, especially on the sides of your cakes.
The Colour Coded sets come in a handy storage tray so you can keep track of your letters easily. Using a Blade or sticky tape, you can release the letters from the tray.
If you need to use the same letter twice, simply measure the gap and apply it individually by hand after. Or purchase an add on pack of letters.