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 our 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 our headspace comparator inserts. Precision machined from 6061 high strength Aluminum Type 3 Hard coat Teflon infused Anodized Short Action Customs Lifetime Warranty Made in the U.S.A! Mfg: Short Action Customs, Llc.