The glass coaster is made of American walnut. The surface has been treated with hard wax oil certified for use for products that might touch food products.
On the upper side there is a design milled out. The details of the wood working can be seen on the attached pictures.
MAINTANENCE: You can clean the product without chemicals, using a cloth or a kitchen roll. If there is of greater filthiness you can use a wet cloth, even with a bit of dish liquid. Afterwards it must be wiped dry. The milled-out details can be cleaned with a brush. To refresh the surface, we recommend wiping the glass coaster using a cleaning product containing bee wax occasionally.
We absolutely do not recommend impregnating the product with kitchen oil. Warning! Washing the product in the dishwasher leads to cracks and strong deformations.