Stabilo Power Wallet Coloring Pens , Set of 18 , Multicolored FIBRE TIP The STABILO power and power max are fibre-tip pens with color-rich application ANTI DRY-OUT Both fibre-tip pens have an extremely long cap-off time - up to 8 weeks without drying out! EXCELLENT WORK STABILO power with its robust M-tip(line width approx. 2mm) and the STABILO power max with its thick XL-tip(line width approx. 3mm) PUSH RESISTANT They have push resistant to ensure durability while children using it FULL VIBRANT COLORS STABILO power comes in 30 and STABILO power max in 18 rich colors