... writing on the surface of different materials.Brilliant color,fadeless.Refill after finishing the ink.Doule black ... length141mm(with big&small double heads)Point size: 5 and 4mm,big tip is felt tip,and ... tip is bullet(all bullet tip is accepted)Color: double red,blue,black,yellow.green,etc10 PCS ... Size: 55×43.5×31.5CMGood quality and delivery time. Sell No.150 permanent Marker pen (12pcs color set)