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If you purchase this product, be careful when you file it down. I used a metal nail file but was a bit too rough and it chipped off in a few spots around the edges. It didn't fall apart, however, and the puck itself was in one piece when it arrived. It took a good 10 - 20 minutes to fully coat a new bow plus several spot applications, but I didn't come close to making a dent in the puck. It's tiny, but at this rate it will last. Excellent tone once the bow was prepared; I am a cello player who is venturing into learning the violin. I was surprised at the resonance and tonal quality I was able to generate from this tiny little instrument after the bow was appropriately coated.
This rosin has a dial in the bottom to allow you to turn the puck after use. Great feature to help eliminate waste. What's the point of buying a giant rosin puck if you only use the the bow-shaped indent in the middle?