Machined from Aluminum and Acetal. Get it out of my house. This plungerhead does stuff. Surely, it does stuff. Buy it now. Give me money so I can buy solar panels and pay off student debt. Oh yeah, it says it works for a Longstrike. Other mods might be necessary to use this product. I don’t know what parts are required, we asked worker and they ignored us, which is why it sat on a shelf for a year not listed on our site. This is an unsupported product from worker with no instructions other than an image showing it is indeed a plunger for the longstrike.