These are some steel balls which can be used for bearing. Adoption of stainless steel material, it is very sturdy, solid and support use. The surface is smooth and even without rust spots, for you to have satisfying using feeling. Can be widely applied for bearing, auto parts, bicycles, valves. Features - Color: silver. - Material: Stainless steel. - Size: 20.50X11.00X1.70cm/ 8.06X4.32X0.67inch.(storage case) - Specification of the beads: 2mm, 2.5mm, 3mm, 3.5mm, 4mm, 4.5mm, 5mm, 5.5mm, 6mm, 7mm, 8mm. - These steel balls are very strong and durable, you can use them for long time. - Can be widely applied for bicycles, motorcycles, furniture, casters, drawer slides, door locks and many other applications. - Lightweight, easy and convenient to carry and store when not in use without any effort. - Adoption of stainless steel material, it is durable and excellent, will not rust, deform, bringing you convenience. - , polished and smooth surface, different specifications for fit your different needs. Package list: 80 x bearing steel balls (2mm) 80 x bearing steel balls (2.5mm) bearing steel balls (3mm) bearing steel balls (3.5mm) bearing steel balls (4mm) bearing steel balls (4.5mm) bearing steel balls (5mm) 30 x bearing steel balls (5.5mm) 30 x bearing steel balls (6mm) 20 x bearing steel balls (7mm) 20 x bearing steel balls (8mm) 11 x airtight bags (6x8cm) 1