Plastic sewing machine bobbin.
TYPE A
Height - 8.67mm approx
Diameter - 21mm approx
Inner Diameter - 6mm approx
Priced per pack - Each pack contains 5 bobbins. 
TYPE B
Height - 11.4mm
Diameter - 20.4mm
Inner Diameter - 6.2mm
Priced per pack - Each pack contains 5 bobbins. 
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