The Worst Part of Playing a Brass Instrument, a Short List: 1: The sheer amount of physical human attraction that it generates from all sexes. 2: Sullen looks from newly bedeafened woodwind players. 3: Tuning slide grease. Nobody likes it. It's annoying. We get it. But it's a necessary evil, so stop whining and start putting something on your horn that NASA has been using for years: Monster slide grease. Thick, long lasting, perfect seal. You won't lose the tub either, like you normally do---this one is too good looking. Sold individually.