Absorbent Coasters. Welcome Friends - Single Absorbent Coaster - This coaster says, "Welcome Friends." It features an image of a beach chair with a large beach umbrella blocking out the sun rays. It is very colorful, with deep blues, some reds, yellows, oranges, and aqua tones. The porous coaster surface absorbs small drips before they reach your furniture. It measures approx 3.7" square, has a cork back, and wipes clean with damp cloth.