1.ball joint rod ends bearing (Models available):

PHS, POS, PHSA, POSA, SI.E, SI..ES, SA..E, SA...ES, SI..TK, SA..TK, SA..BK, GIR..UK, GIR..UK-2RS

2.Material:  

mentallic and non-mentallic materials

metallic materials like brass,bronze,iron,or steel and often plated with zinc or chromium

Non-mentallic materials like  plastic,nylon.