The special bearing makes it really quiet to use. The main unit is made of resin and is lightweight and durable. Even if you press it lightly, it will move smoothly. The maximum load capacity is 330.7 lbs (150 kg). The surface where you place your luggage is non-slip. Product Size (W x D x H): 17.7 x 27.6 x 33.7 inches (45 x 70 x 85.