Grade: G1000/G200/G100 high quality,hardness,polish,good rust resistance,low price This product adopts carbon steel qualitative.We can produce all sizes of products and the grade of the products can be G1000,G500,G200,G100. We will do our best to make sure of that the products all will be superior.Looking forward to your cooperation!Warm Regards! G1000/G200/G100 CARBON STEEL BALL