Description Are you looking for a set of professional, yet affordable pulley block? Are you in search of a sturdy, trustworthy tool that can do multiple jobs at once? If yes, look no further! Our professional pulley block set must meet you needs. It is one of the best choices for you. Features - Color: As shown.- Material: Plastic, metal.- Size: 37.00X15.00X8.00cm/14.54X5.89X3.14in - Perfect for any home, school, or laboratory. Can be used to demonstrate the principle of pulley and how they work in real-world machines.- Improves kids' imagination through interactive play, you can also get involved.- For the future engineers, this is a great way to pique their interest in designing and working with pulleys.- Children create their own structure, exercise their practical abilit, train observation capability, thinking and analytical skills.- A fun way to introduce kids to fixed pulley, movable pulley, mechanical advantage and the conservation of energy.- Note: This pulley block does't have dynamometer and weights.Package list: 2 x single pulleys 2 x double pulleys 1 x holder 2 x ropes