Dear Sir, Good morning! I am laura from Sinoma Advanced Nitride Ceramics Co,Ltd. Our company mainly produce Silicon Nitride HIP balls that are produced by Vesta powder from Sweden.Grade could reach G3. We know you are specialized in bearing field and need ceramic balls.Our quality is good as Coorstek or Tsubaki. Up to now we have cooperated with SKF/Schaeffler/GRW/GMN/SLF/NKE in Europe. Pls kindly take time to look at our presentation and website:www.sinomaceramic.com Samples are free of charge to be tested.Hope you could help us push forward,thank you! Any inquiries,pls feel free to let me know.Pls see 6.35mm ball price as reference. 6.35mm,HIP ball,G5,EXW price is $0.44 per piece. Thanks for your feedback and have a nice day! laura