- The Pentel Energel BL107 with push-button mechanism writes surprisingly smoothly, dries very quickly and does not smudge. *It is the ideal fusion of gel and liquid ink that provides an unparalleled writing pleasure. *The pen is available in 8 different colors, including 4 trendy colors. *The pen consists of 84% recycled material and is refillable with the LR7 refill. *Writing width 0.35mm - ball width 0.7mm.