&NE Lava Stone Coaster, Square, Gray, 1 Piece, 9cm Wide X 9cm Deep X 1cm Thick, Absorbent, Lava Stone, Asbestos-Free, Quick-Drying, Square, Small,

Size (approx.): 9cm wide x 9cm long x 1cm thick Weight (approx.): 66g Material: Lava stone (volcanic rock) and plant fiber Country of origin: China The excellent absorbency of volcanic rock quickly absorbs the water droplets that form on the surface of a glass when you pour a cold drink into it. Coasters also won't stick to the glass. It dries naturally over time, so it requires no maintenance. Porous tissue Porous tissue is formed when magma erupts near the earth's surface, causing the volatile components such as water contained in the magma to turn into gas due to a decrease in pressure, and the magma foams and solidifies, forming countless pores.