These are copper terminals for high electrical conductivity. They are thick, strong, and crimp very well, providing a secure connection. They are well marked for easy size identification. The shrink tubing works great. They are perfectly sized and have an adhesive backing to create a secure yet flexible protective coating at the cable/lug connection. These are well made and high quality cable lugs that offer a secure/reliable connection at a great price making them amazing value for money. I feel safe using them in my solar system and give them 5 stars.
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