The 2.5mm wire is the beginning of the working wire that will hold many of the bends wanted in your arrangements. I've found that you'll use many feet in the mid size wire, 2.0 & 2.5 ...advise considering a larger size next time you buy. Offered at the best price on the web! *Beginner Tip: Press a short lenght of wire against a branch. If the wire bends first & not the branch, try a larger size wire for the job.