Common size is as follows:

Size/cm	Size/inch	Weight/pc	Color
20*28 cm	7.8″*11″	8g	Red
24*30 cm	9.4″*11.8″	10g	Green
26*36 cm	10.2″*14.2″	12g	Red
32*50 cm	12.6″*19.7″	19g	Yellow
35*60 cm	13.8″*23.6″	26g	Blue
40*60 cm	15.7″*23.6″	29g	Red
45*75 cm	17.7″*29.5″	41g	Green
50*80 cm	19.7″*31.5″	46g	Yellow