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The sewing bobbins are made of premium quality plastic, which is transparent and durable, could be reused many times with security notch for consistent bobbin thread winding. These transparent bobbins are smooth and won't scrape the string.7/16 inch/0.39 inch deep bobbins are used for home sewing and embroidery machines of 15 class bobbins. The sewing machine bobbins is standard size, which can be used on most household sewing machine.






