High Precision Glass Beads Decorative Ball For Mechanical Bearing Slide 100pcs This product is high strength, high circularity, few impurities. Product description: colorless, transparent, solid, high-strength, low wear, good chemical stability. Application: grinding beads having a uniform size, smooth surface, high solid content material and ultrafine grinding dry grinding, wet grinding, compared with zirconium oxide beads to wear small machine model. Heat resistance, ear resistance, compressive strength and many other properties. Chemical composition: SiO2 AL2O3 CaO BaO Na2O Zr.O2 Physical properties : Gravity: 2.8g / cm3 Hardness: = 720kg / mm2 Refractive index: Nd =1.50 Round rate: =99% Package: 100pcs Specifications: Solid transparent Category: A-class high-precision Diameter: 7mm/8mm/9mm/10mm/11mm/12mm Net weight: 50g/70g/100g/140g/170g/230g Accuracy error: =0.02mm Usage: Use for laboratory testing, turntable support, slide to mechanical bearings, decoration, etc. Shipping 1.If you need to buy in bulk, please contact, we will reply in 24 hours. 2.We are always working hard to ensure your package arrives as soon as possible. Please understand that some factors like weather, high postal traffic, and the performance of shipping companies are outside of our control. 3.Usually product Reaches after about 12-45 business days depending on destination. If you have not received your shipment within 45 days from payment, please contact us. We will track the shipment and get back to you as soon as possible with a reply. Refund or resend product will be offered if item still not received. 4.We maintain high standards of excellence and strive for 100% customer satisfaction! Feedback is very important. We ask you contact us immediately BEFORE you give us neutral or negative feedback, so that we can satisfactorily address your concerns. It is impossible to address issues if we do not know about them! THANK YOU :)