but be careful: Use only on smooth surfaces because the rear wheel soft rubber wears out quickly once the soil has irregularities. Bitumen is advisable since the gravel roads that have come quickly munch gum of the wheel, and to change it ... ??? the battery is recharging most frequently advertised. The set is very robust and will not disappoint you if you take some precautions. It was put to the test and showed no weaknesses. The build quality is good.