Open hole keys have a hole in the center of the key that the flutist covers with their finger. The open holes are covered by the left hand 2nd and 3rd finger and the right hand 1st, 2nd, and 3rd fingers. Open holes are more popular for all flutes above the student level, and therefore are considered standard in many markets. The open holes allow for extended techniques such as multiphonics or pitch slurs, as well as venting for better pitch. Playing a flute with open holes requires good hand position and finger accuracy. Closed holes, also known as plateau keys, are available by special order only in many markets.