Bruder CAT Track-Type Tractor Stickers Build a simple spring scale

Build a simple spring scale to measure the forces acting on your models and an inclined plane to learn about normal force and gravitational force

it is just the right size for a child’s little arms and hands to play with

20 Sheets of Design Paper

And the largest animal of all—the blue whale—gets a big gatefold

Or leave the bottom area open and add water to make a peaceful stream

Bruder CAT Track-Type Tractor Stickers Build a simple spring scaleThe Bruder CAT Track Type Tractor measures 15 inches long by 7 inches high. A tractor to handle the big jobs! Made of high quality plastics, this tractor features a front blade that can be angled to the left or right and raised up and down to move dirt or sand, plus an adjustable ripper in the rear that can be replaced with other tool accessories sold separately. The individually linked plastic tracks provide an authentic look and sound, and can be