I have these chrome prohopper cylinders I thought they were 8s but they look like 10s but people measure them differently. They work great slap a couple of o-rings in there and your set. I'm asking 50 shipped with money order or 52 shipped with paypal they have to write me a check thats why I charge more for paypal. I have good feedback on here. If you pay by paypal you have to wait for the check to come just like a money order.