These cardboard hatboxes are easy to fold. Comes in sizes; 33cm(measured from corner to corner), 40cm(measured from corner to corner), 57cm(measured from corner to corner), 60cm(measured from corner to corner). The depth of the boxes are; HB33 is approx 20cm, HB40 is approx 14cm, HB57 is approx 24cm, HB60 is approx 24cm