The Lamy Accent and Lamy 2000 4-Color ballpoint use standard mini ballpoint refills. We recommend Monteverde liquid ink mini ballpoint refills available in eleven colors. If you like standard ballpoint ink in your multi-pen, Fisher offers a mini ballpoint refill that can be snapped to the exact size you need. You may even find the pda stylus option useful. This can be installed instead of one of the mini-ballpoint refills.
Your Lamy Accent also fits .7mm lead for the pencil function and has eraser refills available. The Lamy Studio mechanical pencil uses .5mm lead.