Paint on all of these surfaces with these metallic brush pens.  Can be used on rock, paper, glass, plastic, pottery to wood
Metallic marker pens, acid-free, environmental and non-toxic , stop photos fading, easy to use and incredibly popular with kids and adults. Premium Quality -- Oil -based ink, Waterproof, acid-free, environmental and non-toxic

Colors: White, Yellow, Red, Purple, Green, Blue, Black, Orange, Brown, Pink, Gold, Silver

Pen size: 1.5 * 14.3 cm / 0.59 * 5.63 inch
Nib size: 2.2  mm / 0.08  inch 

Tips:

1. Inks Contain quick-drying, nontoxic alcohol-based ink formula.
2. Inks are conforming to the EN71-3 and ASTM D-4236 approved.
3. Inks do comply with the European union-RoHS directive.