Been looking for a surface to assemble a 3000 piece puzzle for a long time and this is it! Other reviewers found problems with the card tubes and I too could not extract one tube from within one other but the problem was found to be a slight distortion to the end of the outer tube interferring with extraction of the inner tube. Running the back of a thumbnail around the inner edge of the outer tube re-established the correct diameter and the inner tube could be withdrawn easily. Care and patience are needed for a one-off operation. The felt mat performs very well with a good quality puzzle but a thin, cheap puzzle will perform less well but still satisfactory. Good product.
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