Please answer a question about the following article about Westminster Abbey:

The exhibits include a collection of royal and other funeral effigies (funeral saddle, helm and shield of Henry V), together with other treasures, including some panels of mediaeval glass, 12th-century sculpture fragments, Mary II's coronation chair and replicas of the coronation regalia, and historic effigies of Edward III, Henry VII and his queen, Elizabeth of York, Charles II, William III, Mary II and Queen Anne.

What kind of panels are in the museum?
panels of mediaeval glass