A very stylish 3-1/2" x 5-1/4" clear acrylic panel, less that 1/2" thick has two flattened hourglass chambers within it. Both have non-toxic fluids and suspended in one are black grains that are heavier than the liquid. In the other are colored grains that are lighter. Flip the timer from one black plastic end to the other and the grains slowly do their things, black down, colored up, over a five minute period. Very soothing for sensory seekers. Colors ship at random.
Low inventory, buy this great product soon!!!!