This apparatus can model how the use of several pulleys increases one's mechanical advantage. A pulley is a variation of the wheel and axle in which a rope or cord is stretched over a wheel to make it rotate as the rope is pulled.Students can use this both qualitatively and quantitatively and its design lends itself easily to scientific enquiry based activities.Supplied with manual.Size : 16 x 9 x 41 cmWeight : 800 g