Recently these highlighters have been runing out and drying up immediately, as in within 20 minutes of use. I order the supplies for our law firm and was told not to order Universal highlighters ever again because they are drying up too quickly. I am ordering Paper Mate and Bic next time to give those a try. We have used the Universal brand for the past 2 years and this is a recent problem (within the last month or so). I've had complaints from 2 employees so far (and we are an office of 20). We like other Universal products, but won't be ordering the highlighters any more.