Material: Gold filled Copper; Size: 4mm ball, 16mm length pin, 1mm hold of the closed ring (conversion 1 inch = 25.4mm or 1mm = 0.0393 inch) Package including: 10Pcs/5pairs(Pack). ...Shipping - These will ship out via stamped mail (no tracking number will be provided). ...We love to hear from our customers. If you are dissatisfied for any reason, please contact us before leaving any negative feedback so we can ensure that you have been satisfied. For any questions email us and we will get back to you. Thanks for looking.