In this video tutorial you can see how to make this macrame flower.
Materials:
Ring diameter - 25 cm / 10 inches
Cotton rope - 3 mm thick
Materials for one petal below:
3 ropes x 80 cm / 32 inches
4 ropes x 120 cm / 47 inches
2 ropes x 100 cm / 39 inches
P.S. - This flower has 6 petals, so materials x 6.