In the 1980s, Sakura surprised the pen industry with its invention of the first gel-based ink. Since then the creamy, colorful Gelly Roll has remained a favorite of people of all ages, occupations, and interests for its bright color selection and the unique properties of the gel ink. The ink in Gelly Roll Classic pens is archival, waterproof, fade resistant, and chemical proof, making it ideal for legal documents, scrapbooks, and any written document where permanence is important.