This block is ideal for people who need to grind smooth curves. There are two sides: the black side is a bit stiffer but still flexible, and the gray side is very flexible. I prefer to use the black side more often and feel the gray side doesn't last as long. It's only been in use for a few weeks and I can already feel it losing its shape. All in all a decent block. I wish they had a block that was all black side material.
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