Can't beat the price, just over $1 each, only 25% cheaper than others. This alone makes it viable, but there are also some nice features.1. The sponges are color coded and grained on the sides, making identification much easier. I can't tell you how many times I've had to guess which sponge I used because I couldn't tell if it wouldn't be a problem anymore. 2. Sponges are quite hard, so you can apply even pressure.3. good sharp corners for internal grinding.4. Grain appears to be well adhered, not too many loose particles.
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