In some examples, a slider may include a an inner slider and an outer slider that are engaged with each other via a number of ball bearings. The inner slider may be longitudinally movable along the outer slider to extend the slider. At one end of the slider, the inner slider may include two first stops holding one or more end ball bearings in place. At the other end of the slider, the outer slider may include two second stops holding one or more end ball bearings in place. In such configuration, when the slider is extended in an open mode, the end of the inner slider that stays insider the outer slider will be held in place and engaged with the outer slider by the end ball bearings. This prevents the inner slider from being shaky when the slider is extended.