Well assembled and works well. The only thing holding it back from 5 stars is the durability, I wish they had lasted a little longer. I haven't done side-by-side comparisons, but they seem to be wearing off quicker than I expected. They stick together very well, so you can keep using them even after they've lost their initial aggressiveness. Some of the other types I've used fall apart once most of the sand is gone.
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