These are the additional bobbins with one holder to fit the Dreamlit shuttle. The set includes 4 bobbins and 1 holder. Material of bobbins and holder: Plastic Petals color bobbins The Dreamlit shuttle is a posted shuttle with removable bobbin! A unique shuttle held together with magnets and can be pulled apart to remove the bobbin. The shuttle can also be used without the bobbin by wrapping thread around the post.