EnerGel liquid gel ink is a high-performance ink technology that combines the best qualities of liquid and gel ink for a super-smooth writing experience. Liquid ink characteristics provide an easy flowing ink supply, while gel ink characteristics include smoothness of writing, vibrant colors and fast-drying capability. REFILLABLE Don't toss out your pens! Did you know that over 90% of EnerGel products are refillable? Why throw away your pen and contribute to landfills when you can replace your depleted ink cartridge with any size and/or color EnerGel refill. Help the environment while saving money! Pentel Cares About Quality For over 70 years, Pentel has supplied the world with the highest quality products. We are a leader in innovation with a commitment to excellence. Pentel is the only writing instrument company to receive the Deming Award* for recognition of the highest standard of quality.