All A R Archer Lace Bobbins are made from:

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Sterilized worked bone rods/bobbins manufactured from food-grade domestic bovine bone sourced from here in the UK 

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Approximate dimensions:

Length: 98mm (3 7/8")

Diameter of a standard bobbin shown here on the right: 5.5mm (7/32")

 

Depending on the design the length will always be the same but the diameter may vary