One tire shop charged me $20 a couple years ago , I got some the other day from a different shop and they gave them to me for free.I did notice the ones I just got had a lot of zinc weights mixed in with them so I would take a wild guess and say between the clips and slag and zinc 20% or so is going to be waste, for free I can't complain.I say they are zinc as they don't melt as fast as the lead ones and have a nice painted surface on them, so I just put them aside.