Only a few exceptions can leave a mark permanently. And here is one such exception. It is water proof, and therefore once written, will last for a very long time. Available in bright colours to make a mark on any surface, these markers are alcohol base and are quick drying and non – bleeding. They are refillable and ASTM D – 4236 Standards are maintained, making it a permanent match to your ever dynamic requirements. Jumbo permanent marker pen with 10mm chisel tip available in a pack of 6 pcs.