Uni-Ball Vision Elite BLX 0.5 mm. Micro Assorted Rollerball Pen offers consistent smoothness and color intensity with an exclusive specially formulated uni-flow ink system which regulates a steady flow of ink to the point. Pen with refillable black barrel features a quick drying, water-resistant, acid-free, uni-super ink with archival quality which gets trapped in the paper and is a 5 color pack including blue, brown, green, purple and red.