amazon piano chord and scale poster chart guitar chord english education poster classroom hanging painting

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20 x25cm (8 x10inches) a4:21 x30cm (8 x12inches) 28 x42cm (11 x17inches) 30 x40cm (12 x16inches) a3:30 x42cm (12 x16.5inches) 40 x50cm (16 x20inches) 40 x60cm (16 x24inches) 50 x70cm (20 x28inches) 60 x80cm (24 x32inches) 60 x90cm (24 x36inches)