The ink in EnerGel BLP77-C is certified Swedish Archives and contains a special, archive-resistant variant of our unique gel ink that is both color-fast and water-repellent. The document pen BLP77 writes permanently with a capital P – to the great joy of posterity. Perfect for signing important documents and for other writings that must not fade over time. EnerGel BLP77 is, despite its exclusive appearance, a light pen that, with its wide rubber grip, sits comfortably in the hand. It provides a smooth, fluid writing with a pigmented ink that dries almost instantly. The ink in EnerGel Rollerball BLP437-C (blue) is Swedish Archives-certified according to ISO 11798. ISO standard 11798 is responsible for ensuring that writing does not fade or otherwise become illegible over time. The standard ISO 11798 specifies requirements for: - The writing's color strength and appearance - Resistance to light, water and heat - Resistance to abrasion. Liquid-Gel-Roller belongs to Pentel's Recycology range: Pentel's Recycology products are more environmentally friendly - 54% of the roller has been produced from recycled material (The percentage is based on the total weight of the product excluding consumables). - Consists of 54% recycled material - Printing mechanism - Tip width: 0.7 mm - Line width: 0.35 mm - Writing color: Blue - Pen body color: Blue - Replaceable cartridge - Refillable with Pentel refill, article no: LRP7 - Swedish Archive certification