For sale is a 250 CF cylinder with a mix of 98% Argon and 2% oxygen. According to the person who gave me this bottle, it is an owner bottle and can be exchanged at Airco any time. I have not bothered to check with Airco, and I do not need this MIG mix as I only weld with TIG and stick. However, if this turns out not to be an owner bottle, I will refund your money, as long as there is the same quantity of gas in it.