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All terminals feature a seam (shown here), a result of the manufacturing process. If given the choice, Ken Whitney said to pay the modest premium for brazed-seam terminals since they maintain their integrity under crimping pressure. Furthermore, personal experience proves that thicker barrel walls retain their crimp better. Here's a tip: While some owner/operator parts stores may or may not offer premium-quality terminals, assure yourself that franchise stores and discount tool outlets most likely do not (based on more personal experience). If at all possible, buy from a dedicated electronics vendor.