[78-L] Vulcan 7'' discs

[Kristjan Saag]

The Vulcan Cylinder Record Company in Sheffield, UK, also issues 7'' 
discs playable with steel needles. Does anyone know what they are made 
of? The company says "a robust resin material", which isn't much of 
information.
https://www.vulcanrecords.com/product-category/7-inch-discs/
Kristjan

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