my big LEGO sets (e.g. Vaders lock as shown in the picture) and they work but there have been some difficulties. About 6 of them didn't work. They either fell apart or their screw mechanism broke (this is how you turn them on/off). The dice aren't labeled to tell you what color they are, so you'll need to organize them if you have a plan. There are no instructions, tips or warnings in the packaging. There aren't enough screws in the pack for all the bricks, so make sure you stock up on extra screws that fit the slots, or just reuse the screws. From what has been said, they do their job of adding a bit of magic to my set. With a little creativity and patience (and I recommend having a Brick Separator handy) you can illuminate any set beautifully.
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