Agreed - vise finger inserts are sized correctly. The same cannot be said of their oval thumb sleeves.
About 3 years ago I ordered both round and oval thumb sleeves and discovered that there is a problem with their thumb sleeve sizing....Round tapered sleeves are correct, but, their oval sleeves are much smaller than the size imprint on the sleeve. I am not using vise sleeves now because I did not want to buy 1 each of all of their oval sleeves. I called the company about this. I do not know if my complaint was addressed - I do hope that they did change the sizing in the mold or provide a conversion chart.
I think 10th frame finger insert sizes are about 1/64" smaller than the expected size. I switched to 10th frame ovals due to a great price and found that the shape of their oval has a very good feel.
--------------------
OnlyBowling