SAKURA-Souffle Opaque Puffy Ink Pens. These fun pens create writing that you can feel! The ballpoint pen features a gel ink that creates a raised matte effect. It writes a bold .7mm line and is water-based, odorless, waterproof on many surfaces and non-toxic. Best used on non-porous, smooth surfaces -- write slowly and allow time for the ink to dry. They work on light or dark surfaces and can be used to embellish and emboss scrapbooks, cards, stamped designs, or any other crafty project. This package contains two pens.