text: A bicycle. The wheels and pedals each form a separate wheel and axle system. The brakes and brake handles are levers, and the seat adjustment is a screw.\n\nOther examples are an an axe or a shovel, which are made of a wedge and a lever; a typewriter or piano keyboard, which utilize a system of two or more levers; a pencil sharpener, which is composed of a wedge and a wheel and axle; and pliers or nail clippers, which are both made of multiple levers.