all sizes quoted do not include backboard glass inner diameter 20 * 30cm inner diameter 30 * 30cm inner diameter 30 * 40cm inner diameter 40 * 40cm inner diameter 40 * 50cm inner diameter 40 * 60cm inner diameter 50 * 50cm inner diameter 50 * 60cm inner diameter 50 * 70cm inner diameter 50 * 80cm inner diameter 50 * 65cm inner diameter 60 * 60cm inner diameter 60 * 75cm inner diameter 60 * 80cm inner diameter 60 * 90cm inner diameter 60 * 120cm inner diameter 70 * 70cm inner diameter 70 * 90cm inner diameter 70 * 100cm inner diameter 80 * 80cm inner diameter 80 * 100cm inner diameter 80 * 120cm inner diameter 90 * 120cm

regular