Rubber Rings,but the steps
1.Add Rubber sap of wooden stick
2.Pull slower 
3.A little while
4.One day,at the sun-dried
5.Wooden stick,Rubber took off again 
6.Machine cut thin
7.Rubber cut,Boil for a while 
8.To recover from the cooked
9.Select the good and bad
10.Sun-dried
THE END
THANK YOU VERY MUCH.
What are they used for?
where you want to use.
for example,any material used for the bonds .