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Description: Packing List: includes 1pc rubber bobbin holders, 20pcs thread spools bobbins, enough quantity to meet your sewing needs and replacements Premium Material: made of premium rubber, which are durable and long lasting for organizing bobbins well. Specification: outer ring diameter: 13.5cm/5.31inch; inner ring diameter: 9cm/3.54inch Wide Application: work for most brand metal or plastic sewing machine bobbins, fit for Singer, Brother, Kenmore, Babylock, Bernina, Elna, Janome and more. Bobbin Organizer: The bobbin ring savers can organize the bobbins well to prevent the unraveling or tangling of thread on bobbin, really save your space. Specification: Material: Rubber, Plastic Outer Ring Diameter: 13.5cm/5.31in Inner Ring Diameter: 9cm/3.54in Thread Bobbin Color: White, Green, Purple, Yellow, Red (4pcs for each color) Package Includes: 1 Pieces Bobbin Holder Ring 20 Pieces Thread Bobbins