6 colors Black, Blue, Orange, Pink, Green, and Yellow Fluorescent colors glow under black light. 30ml capacity. Water-based paint is opaque. Excellent for use on paper and painted surfaces. 15mm block nib is best for smooth surfaces. A great marker for large drawing, sign making, and calligraphy. Handmade in the USA. Conforms to ASTM D-4236. Prop 65 compliant. Warning: May cause irritation. Not recommended for children under 6 years of age. Featured artist: Vincent de Boer