- Familiarity: I've put it through the wringer
Work when you need them. I think the attachment system is one of the toughest I've used, but you don't have a choice it's marker's design.
*IMPORTANT: these do NOT work with the new Duke EPF (2012-13). The EPF is wider and so these don't fit. They'll work with old Dukes, any Barons or Tour F12.