commercial grade rubber balls are manufactured for a variety of industrial applications. 
Compounds for Commercial Grade Balls
• Pure Gum Natural Rubber
• Nitrile (Buna-N)
• Viton® †
• Neoprene
• SBR
• Silicone
• Urethane
†DuPont Dow Registered Trademark

Diameter of Standard Commercial Grade Balls

Inches Inches (decimal) 5/8 0.625 7/8 0.875 1 1.000 1 1/8 1.125 1 1/4 1.250 1 3/8 1.375 1 5/8 1.625 2 2.000 3 3.000

RMA Class A3 Tolerance

Size (in.) Fixed +/– Closed +/– 0.00 - 0.40 .008 .013 0.40 - 0.63 .010 .016 0.63 - 1.00 .013 .020 1.00 - 1.60 .016 .025 1.60 - 2.50 .020 .032 2.50 - 4.00 .025 .040 4.00 - 6.30 .032 .050