Good quality cork - I like the tiles so that I don't have to "unroll" the packs you can buy at crafts stores and wait for them to "unravel." I used my own 3M adhesive squares and they worked swimmingly. The only issue I had with these tiles is that they are not uniform in size. They are close, but if you're building a large board on the wall, it will start to look uneven with a mm in difference in sizing.
We are proud grandparents. Have all this great art work from the grands & not enough wall or refrig to hang things. We hung two tackboards on our hall wall. Up goes the kids' art work. Grandkids call my hall the Art Gallery. I can rotate the art work because I don't have to bother with nails. I just use push pins. The tackboards worked out just great. They look great with the metal trim. They look wonderful with my grandkids' art work.
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