ARTISTRO 6 Spidol Permanen Hitam & Putih, Spidol Cat Berbasis Minyak Ujung Ganda (0.7mm+3mm), Pena Cat Tahan Air untuk Melukis Batu, Keramik, Kaca,

I’ve been using these on old flower pots and a ceramic mug, and the oil-based ink really holds up—no smudging even after a rinse. The 3mm tip lays down solid coverage for filling in letters, while the 0.7mm handles the tiny details on rocks without skipping.

Been using these on old tires to refresh the lettering, and the oil-based ink glides on without any flooding or skipping, even on the curved rubber. The fine 0.7mm tip nails the small details while the 3mm side fills in the wider strokes, and they’re holding up through rain so far.

The dual tip is the selling point for me—switching from the 0.7mm for fine lines to the 3mm for filling in larger areas on my ceramic mugs takes seconds. Ink went on smooth and didn't bleed or skip, even on the curved surfaces.