Etermetal supply titanium and titanium alloy balls which are solid inside, not hollow ones. The popular material is cp grade 2 titanium and titanium alloy grade 5 ti 6Al-4V. Sizes available: from diameter 1mm to 25mm, bigger sizes make to order When the titanium balls are used as jewelry, drill hole service is often needed. The through hole diameter is usually from 0.8mm to 4.5mm according to buyer's design. If the weight of the ball needs to be lighter, hollow titanium balls is suggested. When ordering, please tell us the diameter of the hollow ball you want, we will suggest the stock size for you. Please do not hesitate contact us for more information.