Features 1、These ball bearings are precision designed to achieve the perfect consistency of weight, size and finish. 2、This gives you a very high level of accuracy in each stroke, so that you can make progress and improve your shot. 3、Suitable for target practice and hunting. 4、These steel balls are made of high quality carbon steel and can withstand great impact. 5、A good choice for slingshots and catapults. It also applies to bicycle bearings. Features: These ball bearings are precision designed to achieve the perfect consistency of weight, size and finish. This gives you a very high level of accuracy in each stroke, so that you can make progress and improve your shot. Suitable for target practice and hunting. These steel balls are made of high quality carbon steel and can withstand great impact. A good choice for slingshots and catapults. It also applies to bicycle bearings. Specifications: Condition: 100% Brand New and High Quality Material: Carbon Steel Color: Shown as Pictures Diameter: Approx. 4.5mm / 0.18inch Deviation: Approx. 0.02mm / 7.87inch Hardness: 53HRC Quantity: 600 Weight: Approx. 233g Packing List: 600 x Steel Ball Note: Please notice that there might be some anti-rust oil on the surface of these steel balls. Package List