Abear, both wood and horn have their fans. Both are subject to cracks (usually just surface cracks, that can be sealed with a thread of super glue). The "tail" they follow from Nepal incldes a little jaunt in a cargo bay at over 50,000 ft. and -50° F. Then, they rest in Nevada, in a hot, dry climate for a while, and travel to whatever your environs have in store. The horn can be treated with any ointment for dry animal hooves, found at feed & grain stores, tack & saddle shops or farm coop stores. The wood can be basic - a couple of coats of boiled linseed oil, to a full hand-rubbed gunstock oil finish. Most of the Nepali woods are pretty enough to make this effort very worthwhile, if you like showy wood grain. Once they have acclimated to your local conditions, it takes something extreme to cause a static (non-use) crack. One of the Colo. forumites had some cracking when he left his Khuks in a bag, in the trunk overnight. Colo. sunshine packs some potent radiant energy, and even in cool weather, can run the inside of a car trunk to uncomfortable temps. With very low humidity, the temp falls off rapidly at sundown, and a 70° day (90° in the trunk) with overnight freezing isn't unusual. Give them adequate, if minimal, care and avoid the extremes, and they will look nice and outlast you. Mine that have had cracks repaired, and those bought without flaws, have remained "as wanted", and will serve for years. Do a few searches on "handles", "Hooflex", "Corona", "Horn", etc., etc. and you will get the threads wherein we go to lengths to tell what we do to our handles, and the results. Have fun
