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.
Great bulletin board, a lot better quality than those at Walmart. I wanted something that would last many pinnings since we use this in our mudroom to organize school papers, calendars, etc.
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