Depends of the what types of the bradder you have  –
a Paslode angle bradder takes the ECKO C Series Brads,
the Hikoki and Senco bradder takes the ECKO 15ga DA Brads/BDG Brads
the ECKO ExteriorMaster Air Angle Bradder AB1550FN takes the ECKO 15ga FN Series Angle Brads.
A straight bradder will take ECKO 16ga BC Series Straight Brads