The flight stabilizes the dart by producing drag, thus preventing the rear of the dart from overtaking the point. Modern flights are generally made from plastic, nylon, or foil and are available in a range of shapes and sizes. The three most common shapes in order of size are the standard, the kite, and the smaller pear shape. The less surface area, the less stability but larger flights hamper close grouping. Some manufacturers have sought to solve this by making a flight long and thin but this, in turn, creates other problems such as changing the dart's centre of gravity. Generally speaking, a heavier dart will require a larger flight.