D'Addario Two Way Humidification System Replacement Packets， 3-pack<div style="text-align: left;"><strong>[Product Information]</strong><ul><li><span class="a-list-item"> 3 replacement packs for the D'AddarioTwo Way Humidification System. </span></li><li><span class="a-list-item"> Automatic humidity control protects your instrument against warping， cracks and other damage cause by lack of humidification </span></li><li><span class="a-list-item"> No more manual adjustments based on seasonal changes， geographic locations， temperature， or other factors unlike refillable humidifiers. </span></li><li><span class="a-list-item"> Eliminates the guesswork and anxiety of maintaining your instrument's proper humidity level </span></li></ul></div><img src="http://ecx.images-amazon.com/images/I/41umTP12tBL.jpg" noproxy>