The Metolius Ultralight TCU is is the lightest camming device we tested. It has a time-tested design and maybe the oldest small cam design out there. It is also one of the best values for a camming device. For situations where every ounce counts, it is hard to beat.
For most applications, I would choose the Metolius Master Cam instead because it is more versatile and feels more bomber for big walls and trad climbs. The TCU is 25 percent lighter than the Master Cam, but I still find the master cam plenty light as the difference is only about a half ounce. You will notice the difference only if you are going for the ultimate light rack. If you are mostly doing alpine routes, rock and ice routes or are on a strict budget, it is hard to go wrong with the time-tested Metolius TCU.