Seno-Printed-Circuit-Symbols-Numbers-Letters-Black-Seno-F15-Seno-transfer-symbols-are-etch-resistant-to-60-deg-C-&-are-suitable-for-direct-rubbing-down-onto-PCB-base-material-They-are-completely-impervious-to-light-age-resistant-&-etch-proof-Seno-F15-Numbers-Letters-1-5mm-Black-Sheet-90-x-250mm