Totally indelible ink. Permanent ink with a base of solvents. Round metal pen. Chamfered tip. Cap. Small and medium (double capacity) model width of 4 to 7,5 mm. Extra-large model width 9 to 17 mm. Fast drying. Very long life-span. Very resistant ink color: black-blue-red-green (except extra-large model) sleeve with 4 markers colors: black-red-blue-green: small model chamfered tip sleeve wtih 4 markers colors: black-red-blue-green: small model ogive tip drawing and accessories.