... :SUP7,9,9A,10,11,11A 2)Type:Conventional,Parabolic,Z-type,Galvanized 3)Size:Small & Big size are avaliable Xiamen ... : SUP7, SUP9, SUP9A, SUP10, SUP11, SUP11A;2)Type: Conventional, Parabolic, Z-type, Galvanized, Boat Trailer, Small Trailer, Multi;3)Size: Small ... 6mm to 50mm 5)Certificate: ISO9001/2000 /TS16949 control system. Z type Leaf Spring for Air Suspension