Short Action Customs modular funnel extension is made from 6061 billet aluminum. The extension is anodized with the same type 3 teflon infused coating as the SAC modular funnels. The length of the extension is 1.250a ^2. You can purchase multiple extensions if you wish to have a longer extension. They simply click together like the SAC headspace comparator inserts. FeaturesPrecision machined from 6061 high strength AluminumType 3 Hard coat Teflon infused AnodizedShort Action Customs Lifetime Warranty