CONTAINS 2 MAGNET RINGS AND 2 CARABINERS. MAGNET STRENGTH IS 25 POUNDS EACH. PLASTIC COMPONENTS AND A METAL SPRING. HANG 2″ PLASTIC CHAIN IN LENGTHS UP TO 30 FT. BETWEEN METAL OBJECTS. USE WITH MR. CHAIN’S PLASTIC CHAIN TO CREATE A VISUAL WARNING AND RESTRICT ACCESS IN WAREHOUSES, MANUFACTURING PLANTS AND ELSEWHERE. CHAINS NOT INCLUDED.