Aluminum is significantly lighter than steel and is therefore fat more popular in the outdoor and climbing industries where weight is a major factor.
Non-Locking Gate for general use and when clipping quickly is important. All non-locking carabiners are spring-loaded to ensure immediate gate closure upon release.
Bent gate allows a faster and more ergonomic clip in.
Key nose carabiner does not have a notch to snag onto anything. Making clipping/unclipping simple.
Ergonomic shape minimizes physical effort and discomfort, maximize efficiency.