This cover includes 3 pieces: 1 frame cover, 1 backrest cover and 1 seat cushion cover. It will only fit the IKEA Ängby armchair sold from 2000-2002, not similar models. This model comes in different sizes  Please measure your chair to ensure you choose the correct size.   A – Remove the seat cushion. Measure the length along back of the cushion, from one corner to the other. See illustration. B – Measure depth of the armrest from back to front of armrest. See illustration. Standard size: A = Approximately 52 cm , B = Approximately 69 cm Small size: A = Approximately 46 cm , B = Approximately 66 cm