The basket is a steel rim diameter with an attached net affixed to a backboard that measures and one basket is at each end of the court. The white outlined box on the backboard is high and wide. At almost all levels of competition, the top of the rim is exactly above the court and inside the baseline. While variation is possible in the dimensions of the court and backboard, it is considered important for the basket to be of the correct height – a rim that is off by just a few inches can have an adverse effect on shooting. The net must "check the ball momentarily as it passes through the basket" to aid the visual confirmation that the ball went through. The act of checking the ball has the further advantage of slowing down the ball so the rebound doesn't go as far.