According to the 0.5 meter length price，

Width is 50.60.70.80.90.100CM fixed

For 90CM size，

The number of unit 1 is 0.90 x 0.5 metres length， the number of unit 2 is 0.90 x 1 meters length

 

The number of unit 3 is 0.90 x 1.5 metres length， the number of shoot 4 is 0.90 x 2 meters length