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The product itself works great, but one of them arrived really cracked. The first time I ordered, both were cracked. I don't want to go through the hassle of returning again so I'll just use the one that I have.
I use a treadle sewing machine and the belt was slipping when sewing heavier material. Tightening the belt didn't help and I read that putting rosin on the belt would help. I bought these because they were inexpensive and they work great. Yesterday I was able to sew 6 layers 500 denier coated nylon canvas.
The little blocks are perfect to hold against the belt while running the machine with the clutch disengaged.
Another great Amazon product that does it's job and I could never find in our little town and would have to pay three times as much and a 100 mile drive to find here.
My daughter’s violin bow got greased. I tried her old rosin and a brand new professional brand rosin. I put a lot in the bow, but the bow can’t vibrate well any more. I purchased this dark rosin. To my surprise, I only applied a little, the sound comes out! After 3 days of slippery and muffled sound, and after I had put a lot of rosin from different brands, I almost wanted to buy a new bow and a new violin. This rosin changed everything. It saves my daughter’s violin and the bow.
I've dropped many rosin bars before, having 2 for the price of one is great. The rosin applies smoothly and works great with my cello bow. The price was an exceptional value. Now I have an extra in case I drop one. Shipping was quick and packaging was good.