Hello Big Sioux Saddlery the 7x3 is actually the really sharp pointy needle. the 794S is more rounded. they both seem to work fine, I just wanted to know which needle I should be using since I am sewing through 16 oz of thick leather. I not to familiar with needles. I have read other topics and have some what of an understand of the needle system. These are the only 2 different needles leather machine company offers for my cobra class 4. Is there a specific needle I should be using to make my belts?