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It works well but it's ever so slightly not perfectly shaped. I feel like one side is a bit uneven. But that's being really picky. The pieces of cork are a bit chunkier than another set that I have and a few from the corners have dislodged so that's annoying because it makes a bit of a mess and the more I use it, the less yoga brick I will probably have.
I LOVE these blocks! Much better for grip and feeling supported! I have foam blocks as well but these I find are more comfortable for supported fish/bridge because they hold you up better & are less slippery for a more aggressive sweaty asana practice.
A block is a block but the material makes all the difference for me. This cork block is soft to the touch but firm enough to put under my low back during bridging. My boyfriend enjoyed it for bridging too so I ordered another. This makes an excellent gift.