Ink Pad: Stazon Metallic (Various colours)
Stazon Metallic inkpad with refill ink bottle.
The best ink I've found; you can use it on glass, plastic, leather, ceramic, stone, pretty much anything! The pigment is nice and strong.
And the inkpad itself lasts for ages and ages, especially with the refill bottle so that it doesn't dry out or get dirty. Price per inkpad.