8-3/4" Rounded Angle Agate Burnishers

Overall the quality of these burnishers is very good. Out of 10 purchased, two were not usable. As these items are in sealed boxes, the vendor would not know the quality of the items inside. (I didn't contact Utopia because I didn't discover the problem until too much time passed since the purchase.)
One of the agates was not polished and the other chipped. I use these for gold foil application and need them to be super smooth.