Inquiry (采购产品): Black glass balls; Customer Service; Can you supply black glass balls? If so pleas quote the following: 5500pcs of a 5/16"( 0.3125") Black Glass, Polished with Special Grade Requirements; Dia. Tolerance +/-0.0001" Roundness/Spericity: 0.0001" Weight .645G-.672G Specific Gravity 2.515 +/-2% Surface Finish 1.0 micro-inches, Highly Polished ***MUST MEET ABOVE SPEC*** **** Hidden Message ***** Tammy Cahill 43416 Company: Machining Technologies, Inc. E-mail: tammy@machiningtech.com **** Hidden Message ***** tammy@machiningtech.com