We have ordered 300 balls for our son in the first course and were surprised by the quality. When ordering from 400 balls we were unlucky with the blue. Some had holes, some were dented before the games. Too bad, but at 700 balls fall 20 indented not likely to sooner or later.
For quantity Orientation: we have the travel cot 1,20x60 made the ball pit and have 700 balls good 3 layers in which the children can rooting.