Handmade in the USA from Baltic Birch plywood, this set of four coasters is the epitome of functional art. Each coaster is designed to trap the water down in the pattern so it does not stick to the glass.The water then dries out and does not harm the wood. Engineering as an art, Baltic by Design is a Veteran-owned small family business that creates laser-cut wooden gifts and decor. Measures 3.5 in.