got 2 types here. 1 is blue cables with black heads (RM100 - RM150 for 2nd's). Another is blue cables with blue head (Usually RM150-200 for 2nd's). The later is the better one. Old cable can cause kick back ooo... causing distributor to 'kong' faster.....
but best is spoons or nology (the ones which have individual groundings). These cables also store charge until max to provide maximum and consistent powerful flow of charge... woohoo... but blurdy expensive...