We have 2 Metal / plastic Pullies Vintage items.  The large one measures about 3 7/8" in H x about 2 5/8" in w at it's widest point x about 1/2" in d on the pulley.  This one is completely plastic.  The smaller one has a plastic pulley wheel and a metal frame holding the wheel.  This one measures about 2 3/4" in h x about 1 3/8" across the wheel with the wheel dept being about 3/8" across.  I believe the frame is galvanized metal.  There is a touch of rust/tarnish on the top.