This speaker stand is made of high density board. For the size of product is large, and it is a disassembled parts when it is shipped. When the product is received, it can be used after installation with an Allen screw wrench. Inject sand from the sand filling port on the top of the speaker stand and install the internal expansion screws. Filling the sand filling port with sand increases the weight and the internal expansion screws become tighter and tighter. Don’t compare with our products that use ordinary screws directly attached to the board. The bottom is closed. Note that the one with a hole (with a sand filling port) is upward, and the one without a hole is the bottom.