The Kong Safety Leash + Lifeline Double Action Elastic, 2 Hooks is a high-quality elasticated safety leash with an overload indicator. This safety leash is equipped with a special one-hand double-action safety carabiner made of aluminium and a self-locking, asymmetrical stainless steel carabiner and complies withEN ISO 12041 andOSR-ISAF guidelines.Checking the overload indicator:The special safety seam on the stainless steel carabiner (body side) opens after an overload. If this seam is broken, the safety line must be replaced.