Here is a description of the 3FT Bowl Liner. Cone Bowl Liner. Spring Cone Crusher Parts: Items: Concave, Mantle, Concave Ring, Concave Segment, Bowl Liner,Cone Liner,Arm Guard, Distribution Plate. Casting Material: Austenstic Manganese Steel (Mn14, M14Cr2, Mn18Cr2, Mn22Cr2)