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The plastic blanks are a produst we use in the dental trade to manufacture gumshields, impression trays(if you have dentures or crowns you`ll know what i mean). The ones we use are available from dental equipment suppliers and cost about 40p each plus vat and carriage. They are roughly the same size as a cd box and are available in various thickness from 0.5mm to around 5mm. the more you buy the cheaper they get! The ones i useed were just in the cupboard gathering dust. thats the only reason why i chose that thickness.
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