Emours Aquarium Decor Wood Fish Tank Decoration Driftwood Size and Shape Varies,Large( 9 -12 inch length)Brand: emours Color: Brown Features: Made of high grade driftwood, solid and durable, long lasting in underwater or arid environments Authentic natural wood adds realistic beauty. Unique shapes that adds to the aesthetic value of the tank About the float. Driftwood may not sink into water sometimes which caused by the density issue. We cant guarantee that 100% of the driftwood can sink into water. Instruction: Better boiling it in hot water for 1 2