The coasters are sustainably-sourced eucalyptus hardboard, and non-slip cork base. They are vinyl printed making them heat, moisture and UV-resistant.  By weight they are over 95% recyclable; only the protective laminate and vinyl is non-recyclable. The size is 10x10cm  and made in the UK. 

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I currently have an offer to buy 5 coasters and get the 6th coaster free.