A bright spot The neroperla finish on the Aurora Optima rollerball won't be the only bright spot in your day. You may be blinded by the smiles that appear each time you pull out this pen. Glowing silver colored trim accents the neroperla gray resin, as well as the red and blue models. Subdued designs on the center ring are an Aurora trademark. Refill with any standard rollerball refill, available here in three point sizes and up to eight different colors.