MULTI PURPOSE 8 PACK DUAL TIP LIQUID CHALK MARKER PENS -Vibrant Reversible Tip Dry Erase Markers, Non Toxic, Safe for Kids - Used on Chalkboard Signs, Blackboards, Glass, Windows... 8 Multi Purpose Liquid Multi Color Chalk Marker Pens Create, Erase And Re-Create. Easy To Use, Easy To Wipe, Easy To Reuse Non Toxic. Green Production. Eco Friendly. Child Friendly. Safe To Use Reversible Tip! One Bullet Side (rounded) One Chisle Side (square) Perfect For Non-Porous Surfaces (chalkboards, plastics, metals, glass, ceramics)