GRABOBBIN Magnetic Bobbin Holder For Steel Bobbins GRABOBBIN Magnetic Bobbin Holder No more runaway bobbins unwinding as they go. Grabobbin holds each bobbin tightly on its rim. This product easily displays thread colors on each bobbin and allows instant easy access. 8" plastic rack with magnetic strip includes one metal bobbin Holds approximatley 16 bobbins. For steel bobbins only.