... filter bags (#1,#2,#3, 4 ) 2).Absolute micron filter bags.(#1,#2,#3, 4 ) 3).Long time filter bags.(#1,#2,#3, 4 ) 4).High flux filter bag.(#1,#2,#3, 4 ) 5).Oil absorbed filter bag.(#1,#2,#3, 4 ) 6 ... U style)V (End construction V style)H: SF (Silicon free)ST (Standard)