Our coasters are made from food contact approved birchwood veneer and manufactured in an environmentally friendly process approved by forest stewardship council. They have a 90mm diameter, are 3mm thick and dishwasher proof. We have 29 different styles of coaster: on one side is a pattern or motif, on the other side is a letter of the alphabet and a tiny hippstory logo. All the coasters are designed by julia nielsen. As well as protecting tables and other surfaces from hot mugs and water stains these little shards of design can change the look of a living room or dining setting in an instant.