Driftwood and a board I picked up at the beach. It's 10cm wide and 7cm long (measured by an amateur). As it is a natural item, there may be sand, chips, cracks, etc. Please refrain from purchasing if you are concerned. It has been dried in the sun. Tannin removal has not been processed. Please perform tannin removal yourself. I have not confirmed if it sinks in water. Please use it in aquariums or terrariums at your own risk. How about using it for gardening, handmade crafts, etc.?