Pre-wounded bobbins nylon thread size G Colour Grey NM40

10 Pre-wounded bobbins nylon thread size G Colour Grey NM40
These pre-wounded bobbins and manufactured in the United Kingdom. 
They are excellent for sewing heavy weight materials, such as leather goods, footwear, and denim jeans. 
They are used throughout alteration shops, colleges, and industries. 
They are made so that you can sew quicker without the need to be constantly winding the bobbin. 
They are just as good quality as your normal threads. 
Every thread is waxed in a silky layer to ensure that they are sewn in smoothly. 
Each bobbin is estimated to be around 34M of length.  They are made out of nylon.