They work fine. You must be very careful to place each layer exactly over the previous images. Make sure you place it exactly where you need it because once it's stuck you can't pull it out to change position. He discovered this the hard way and ripped off one of the fins in the second picture. They were bigger than I really wanted, but it's my fault for not reading the description better. Make sure there is about 1/8 inch between each image for a truly stunning 3D image.
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