Pentel Energel Rtx Pens, 0.7 Mm, Medium Point, 8-Pack, Assorted Ink Colors. The ENER-GEL RTX offers a luxury feel and a smooth, effortless writing experience. High performance ink technology combines the best qualities of liquid and gel ink. Fast-drying liquid gel ink is great for left handers - no smears, no smudges, no globs. The sleek and stylish barrel design features stainless steel accents for a professional look. The latex-free grip provides extended comfort and control when writing. It is available with a 0. 7mm stainless steel tip writes medium lines, 1. 0mm tip writes bold lines. Refillable with any size and/or color ENER-GEL refill. It is backed by a limited lifetime . Office Supplies