Adjusta-Bell "Delta-40" ShellWildman Athletica has teamed up with Hephaestus Athletica to offer the all new "Delta 40" adjustable kettlebell. This new bell adjusts from 14kg to 40kg in 0. 25kg increments. The Adjusta Bell "Delta 40" Shell will replace the bottom cast iron shell of the D40 bell and drop the empty weight of the system to about 9kg (19. 8 lbs.). This allows virtually anyone to start training with this system and work their way up in weight in small increments. This