Like mick said, fan motors and transformers. Also microwaves if thy are older ones and agian the fan motor in there. I see lots of microwaves thrown in as "whole" not broken down in the shred pile alnog with fans. There is a good peice of copper spool/ transformer in newer style exersize bikes. has to be around 3 lbs minus the steel its wraped around. So take the plastic off them exersize machines / tredmills.