Features
- mechanic toys: made of plastic material, and for a long time use,experiments pulley equipment
- Pulley block: and , performance,physical experiment pulley
- Educational toys: made of plastic materials, for a long time use,student pulley block
- Small pulley block: though it is simple in design, it’s so practical when you use it,roller loading pulley
- School supplies: a fun introduce to fixed pulley, movable pulley, mechanical advantage and the conservation of energy,student pulley wheel
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