Wood: Oak Single or split pedal functionality Rattle free handles with easy and secure adjustment Removable handles adjust easily via a single ‘twist and pull’ knob 2 heavy springs and 2 light springs Included Import North American Oak Where did oak wood come from? The oak wood is produced in Russia, the United States, Canada and Greenland. How is the material of Oak? Oak wood has a strong resistance to decay, the density is relatively high, the strength and hardness are also very high, and the bearing capacity is also very high in terms of mechanics. Stable as a mountain during exercise Using a North American oak solid wood bed weighing up to 48kg. 3 major features science profession Accessories