Long writing marker Waterproof. Refillable Quick dry and strong adherence ink. Can write on most surfaces. Low odour ink, recap tighten after use. For use in schools, offices and homes. Tip: Strong Acrylic tip suitable for a smooth surface like glass or cartons & endurance quality for wooden crates and boxes. Form and Grip: An attractive design with clip-on cap, wide base (if someone rests standing) and appropriate width at the gripping point. Ink and reservoir: At per or better writing length than peers good for glass, plastic, metal etc. Refillable: Unique backend unscrewing mechanism. Just pull open cap> Place at backend > unscrew the plug & drop ink in the reservoir. (solo)