Universal Hardware PartsChina 5mm 5.5mm 6mm 6.5mm 7mm 7.5mm Grade G100-G1000 Material AISI 1010/1015/Q235 Solid Loose Carbon Steel Balls for Bicycle Bearing Pulley Slingshot Slide Rail Craft, Find details about China Steel Ball, Carbon Steel Ball from 5mm 5.5mm 6mm 6.5mm 7mm 7.5mm Grade G100-G1000 Material AISI 1010/1015/Q235 Solid Loose Carbon Steel Balls for Bicycle Bearing Pulley Slingshot Slide Rail Craft