Omega Pacific are specialist karabiner manufacturers from Washington state in USA. Each Omega karabiner is manufactured from high quality aircraft specification alloys. Samples from each production lot are destruction tested to ensure structural integrity. Each karabiner is hand inspected 5 times to ensure proper functioning and smooth gate action. All karabiners are designed to open under body weight and are proof tested to half their rated strength. The small indentations on the inside radii are evidence of this testing and Omega's stringent quality control procedures.