Wilwood dynalite front drag race brake question

Well if you look at the weight of the two kits I believe that last time I looked you save 9 lbs a side with the slotted not drilled slotted,They list the weights In Jegs I believe or summit,It might nit be that much but it is a bunch of weight difference,We went slotted and got them from Dr.Diff (Case) he had the best price at the time and is a great guy to deal with --Steve