I have a few of them and I dont know, but for some reason a few of them the inner resin has expanded and they split at the top of the body. They still work fine, but I was just passing this along incase your quality control guys wanted to know. The other thing is, I see I can buy 2/0 and 3/0 stinger hooks that came on the smaller waxwings, but I cant find the size that comes with the senior. The Owner catalog only lists the 2/0 and 3/0. Is there a replacement hook for the senior size?