The material is high-quality, high-purity aluminum, an original product from a pure solid plate. In terms of electrical resistance, aluminum is superior in electrical conductivity, following silver, copper, and gold. The resistance values of gold and aluminum are almost the same. Aluminum's resistance is about 1.5 times that of copper. Since aluminum is lighter than copper, it conducts more than twice as much electricity as copper when compared by the same weight. "Doesn't aluminum not conduct electricity??" It conducts electricity because it's a metal. Aluminum is an element, so it won't conduct electricity if it has impurities, surface treatments, anodizing, or Alpina treatment. Aluminum is also used inside capacitors. ~Accessories & Specs~ Part Number: 5TBU 5-hole M6 specification with ball bearings. Not tapped. *The mounting part is also an M6 hole. Unichrome bolts and nuts x 5 BT mounting flange nut x 1 This product is made for grounding purposes in grounding tuning. Since it has 5 holes, it should be versatile. As this is an original processed product, please understand that there may be processing scratches, minor scratches, slight dimensional errors, and distortions. We do not accept price negotiations. We do not ship on weekends and holidays. Shipping dates will follow the app's guidelines.