Some like to call pieces like this Voodoo rosary but it is Damballa. Damballa is the most powerful type of magic and spirit in Voodoo no matter what part of the world it is coming from. This magic is not black or white but whatever you make it. This is also exactly what you need or want created.
I'm trying to think of a example that I can give you. Lets say you have a ex that has moved on but left you totally screwed over and you want to see them suffer. You decide in what way you want them to suffer meaning death or allow the Damballa decide. If they Damballa decides it would not be but what is fitting for the crime.
If wealth is what you need then you can have Damballa create wealth for you as Damballa is a creator of all.
To use this piece you must make a offering of anything you feel is nice. Fruit, flowers, jewelry or even wine is fine.
All situations and needs can be meet with this type of voodoo.