Moisteners apply water using wick rollers to transfer the water. This is much more effective than the ``brush-type`` moisteners which actually scrape adhesive off the back of the label.  They do the job quickly, cleanly, and economically. The Model C is used for wetting envelopes and can also moisten labels up to 4.5`` wide. The Model S is used for wetting labels up to 5.75`` wide.