Lift heavy objects with ease using a block and tackle. Everyone has heard of it, but not many people know how a block and tackle really works. This explorer set allows you to build several different block and tackle applications and try them out. It’s incredible what a few pulleys and a piece of string can do if you put your mind to it. The important thing isn’t how strong you are but how intelligently you apply your strength. Explorer set for children 10 years and over, box 15.7 x 11.7 x 4.6 cm (6” x 5” x 2” approx.), weight 330 g.