TMS A4 Magnetic Sheets - Magnets for Crafts, 0.5mm Flexible Sheeting for Die Storage, Art, Crafts or Making Your own Fridge Magnets - 6 Pack - by The Magnet Shop

It is in the product description though. I did not see that so I was quite disappointed that even strong magnets won't stick to it very well. Buy metallized rubber sheets instead if that is what you were going to use this for like me.

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Magnet is not strong! It could be a waste of money. I would suggest not to buy! Waste of money. It can be useful in case of photos (very light weight products)

I love these magnet sheets for storing my thin metal dies on. It's really easy to cut with scissors, so you can customise it to your own storage device. I use an A4 Display book (the type with clear plastic wallets fixed into a cover). To fit the pockets easily I trim off a 5mm strip from the long side of each magnet sheet , apply double sided tape to the non-magnetic face and stick it onto a sheet of greyboard to stiffen it, load up with dies and then slide the whole thing into a clear pocket. The greyboard stops the magnet sheet flexing as you take it in and out of the pocket to access the dies, as that makes all the dies pop off the surface, and that's really annoying. I use a Posca white paint pen to write on the magnetic face (useful for scripty word dies which are hard to read in reverse, or to identify coordinating dies). Then, I can stick the 5mm strips (I cut off the magnet sheets first) onto more card, and create die holders that fit in my stamp storage folder next to the coordinating stamp sets. It's a bit of work, but the results are great and make using and storing dies much easier, clearer and damage free. These sheets are really versatile and easy to use, highly recommended.