It can be any material.

In a table, compare the prices/b for three different metal powders with prices for round bar stock of the same material. Use the internet to find prices. Provide links that lead directly to pages with prices It is challenging to find these prices online, but it can be done. Don't put this off to the last minute. I don't recommend writing to salespeople, as they don't typically respond to student requests. Hint: moke sure you convert prices for bar stock to price/b, otherwise comparison is impossible! Price ($/Ib) Material Bar