This marsh 99 formula is the replacement for the marsh t ink. It's pretty dang good and close to the original you wouldn't really be able to tell the difference between the two. I'm very impressed. Quick and secure shipping and the bundle saved me so much money than buying them separately. I've heard horror stories about these types of industrial markers from the past but so far a month in and the original tip is still going strong and hasn't leaked yet. Remember each time you use it to shake it first and dispell the air in the barrel by pressing down on the tip while it's vertical with the tip facing upwards. Let's the air out and will avoid puddling. All in all a great product and a great company providing it.

Rock solid product. There is a technique to it, but it works. Shipping was crazy fast, and item was packaged securely.