Always striving toward excellence, W&J has developed to be a market-driven and customer-oriented enterprise. We focus on strengthening the capabilities of scientific research and completing service businesses. We have set up a customer service department to better provide customers with prompt services including order tracking notice. hydrostatic equilibrium If you are interested in our new product hydrostatic equilibrium and others, welcome you to contact us.Containing no heavy metals such as lead, cadmium, and mercury that can not biodegrade, it causes no pollution to the land and water.