Our engraved slate coasters drive traffic to your website in a new way! These are a business card that will be kept and used. Our coasters measure 4" x 4" with a natural edge, each with 4 rubber stickers on the bottom to protect surfaces. Engrave these with your logo, a custom quote or picture. If you have a logo file, please send to us by email with your order number. Design@OiDela.com All designs are completely custom! Details are engraved and will not wash off.