These are the exact same blanks that my baits are made from. There are tons of crankbait blanks on the market and you can certainly find cheaper ones out there. Many of them have manufacturing defects. Others don't run well at all, especially at higher trolling speeds and need constant tuning. I learned this first-hand, as my early baits had this issue. See picture below of the new blanks on the right vs the older blanks on the left.
However, after months of "trial and error", I finally found a supplier that I am happy with. I check each blank for flaws when I receive them to ensure that I am shipping out only the highest quality product. When I first started getting blanks from this supplier, about 25% had issues at the seam. Therefore, to correct that, I had been pre-dipping them in KBS to resolve this issue. However, after working with the supplier to correct this issue, my most recent shipment of blanks has been flawless. I have not found a single blank that had any defects. As a result, I no longer need to pre-dip them in KBS and I have reduced my prices accordingly. If you are not 100% satisfied with these blanks, send them back and I will gladly refund your money.
Note: Each blank comes with three black nickel #4 trebles, and 4 heavy-duty split rings.
Note 2: I now carry 1/4 inch stick-on eyes in various colors that can be ordered with your blanks.