Whether you're using this for tree work, rock climbing, or even as a pulley in the weight room (yes, even that), this Omni-block 2.0 has your back. Mine was not red, but copper colored; a nice surprise. There is only smoothness here, and it's smooth for every weight, every task in the field. You're only going to need to buy one, and this is the brand you want, for whatever size you need a pulley.