Helix Color Peps My First Jumbo Markers - Jumbo markers feature 0.5mm, blocked safety tips that are locked in both directions to prevent them from pushing in and tearing off. Water-based ink goes on smooth and bright without bleeding through most papers for legible results. Ultra-washable colors remove easily from skin, clothes and walls in just one wash. Nontoxic formula ensures safe handling and use by young children ages 18 months and above.