This metal construction kit is made by Germany by Eitech and is of good quality. The box contains a plastic bag of the bits - metal plates, nuts and bolts, screw, axles, etc. and the screwdriver and spanner/wrench and from this you can make the tracked digger and at least2 other possible models but you need to dismantle one to make another. You even have to put the plastic track together.. There are 3 instruction leaflets in pictures. For the tracked scoop vehicle there are 155 pieces. The tracked digger has 208 pieces. The tracked bulldozer has 187 pieces. It says on the box for children 8+ but I think an adult would need to put aside a rainy afternoon to help - and don't lose the instruction leaflets! Not expensive for the quality.