Round or Square White Pulpboard. What's special about our mat coasters is printing the entire surface economically on both sides in quantitiesstarting at just 10,000 pieces. Your advertising message and logo can be read repeatedly on these reusable coasters.White Pulpboard. While highly absorbent, the hard mat board allows for the highest quality multi-color graphics. Biodegradable, recyclable, and environmentally safe with soy inks, these pulp board beverage coasters are durable, absorbent, warp resistant, and color fast. Custom-imprinted coasters for brand and company recognition belong wherever people gather to be served food and drink. When taken home, your mat coasters can sell your message for months. Give your business this constant exposure!