Durable: Leto Ink has durable bright and vivid colors which makes it easy to read  in the classroom or meetings.Refillable system:  replaceable filter element with Ink Level IndicatorWipe Easily: Writing smoothly and drying quickly with washable ink can easily wiped off from whiteboards, glass, mirror, and most non-porous surfaces with any cloth or eraser.Wide Use Occasions: The kit is suitable for both adults and kids. Perfect for use in classroom, office, home and studio with whiteboards, glass, mirrors, and non-porous surface.Safety Guarantee: Non toxic and  Low-odor and no xylene & toluene ,eco-friendly. The Ink is not suitable for the children under 3 years old , store markers horizontally to avoid ink leakageFine Tip:  designed to make precise lines on any kind of surface