STEEL-carbon steel material for most cages and connecting parts. Recommended for mild to average pumping conditions where abrasion and corrosion are not a problem. STAINLESS-304-recommended for corrosive environments STAINLESS-316-higher grade stainless with better corrosion resistance than 304 MONEL-for extreme corrosion and heavy deep well applications BRASS-admiralty brass recommended for mild abrasion and average to severe corrosion. ALLOY-special high strength alloy steel parts made upon request for special applications. HARDLINED-for increased cage life, cages are available with a #6 genuine stellite lining on ball guides. Available in steel, stainless, and monel.