... hydraulic and electric( two seats in a group, four seats in a group, six seats in a group and eight seats in a group).2 ... the human streamline, vogue, beautiful and dynamic. The material of seats are waterproof, moisture proof, antiflaming, wear-resisting and long ... roll, vibration, water spray, wind blast, leg tickler and etc seats and environment effects.3. Advantages 3DOF products have the advantage ...