7/8 OD at about 0.04 wall is instrument tubing, not the catalog stick McMaster wants you to buy by the 12-foot minimum. Band-repair suppliers usually cut yellow brass shorter and cheaper: Ferree's Tools, Allied Music, or a local shop that already stocks crooks and slide stock. Metal Supermarkets and Speedy Metals are worth a call if you only need a couple feet and can live with their cut fee. What are you forming, a crook, a slide section, or something that has to take a flare? Temper matters as much as the price.