This pendant features a mobius style spiral that can enclose a 6mm ball which jingles and jangles when worn.
If you'd prefer a right hand spiral, please see; http://www.shapeways.com/model/169011
Shapeways have decided that this model is unprintable with the ball enclosed.
This model will take a 6mm steel ball which can be fitted by gently forcing open the spiral... see video.
A 5mm ball is available here; http://www.shapeways.com/model/172759 or simply use a suitable (4.5mm-6mm) ball bearing.