SAFE TEC DUCK-R Backup Device Fall arrest device. Supports a load of two people during rescue. ■ Weight: 260g ■ Size: Approximately 10cm x 7cm, thickness 4cm ■ EN 12841 Type A (Fall arrest for safety lines) ■ Compatible rope diameter: 10.5mm to 11mm (using EN1891:1998 Type A) Used for about a year, but I'm selling it because I've updated my equipment. There are minor scratches and dirt, but it has never experienced an impact load and is in good working order.