Refills for Construction Ballpoint Pens, Mini Pens and Key-chain Pens and Troika's Mechanical Pencils and Clutch Pencils. We also carry Roller-ball refills for Troika Roller-ball pens, such as the Troika World in your Hand Rollerball Pen as well as Key-chain spare parts. Troikaus.com is operated by the official Troika's USA Distributor and refills and spare parts are guaranteed to work with your Troika item. Troika accessories and pens are of very high quality and built to last. These refills and spare parts will make your favorite Troika Pen or Key-chain function as new.