Origami paper 40 sheets (Reversible paper will make a good hue.)
Two of strings (The length of the string multiplies the diameter of work by three. The length of a part is the radiuses of the work.) It can use thread as two or three fold.
A needle and thread
Something as marks (optional)
If you make a work with paper which has color in one side, fold it so that a color is given to the petal. It may be gorgeous finish more.
Also when parts are gotten together into the whole, the part except the petals will not be seen well.
Please be careful about colors of paper, when you start to fold process 1.
Open and squash
The backside is folded in the same way as processes 5 - 7, too.