These coasters are made of fabric scraps left over from sewing larger pieces - the progression might be a woman's blouse first, then a child's top, then face masks, an eyeglasses case or two, then finally a few coasters.
They come in sets of four, each set and each individual coaster is unique so the set you purchase is not going to be the same as any other. Fabrics used are a mix of Hungarian traditional cotton wax resist prints, Ankara prints, Indian cotton prints, denim, and linen fabrics in the color family shown in the product images.