String, string, string,and string. I had a metal loop a couple of years ago, and it ate up my serving. I drew on a very nice 8, and had him dead to rights, BUT, my serving was compressed by the metal loop and my nock came off of the string. I found myself at full draw with my arrow still on the rest![:@]By the time I let down a redrew he was in the thicket![:@][:@][]My oldest son got him on the last day of gunseason out of the same tree.