The Minirail System has a maximum weight capacity of 25kgs per lineal metre  10kgs per nylon cable, 25kgs per steel cable, the hooks have various maximum weight ratings which can be found in the description column on the product's info and pricing pages. When using two hangers and two hooks for one picture (recommended for stability), you can double the maximum weight capacity i.e 2 x 4kg HM hooks will hold an 8kg picture. The AVR system is rated at 25kgs per lineal metre on the rails, 10kgs per nylon hanger and 20kgs per stainless steel hanger, compatible hooks and components can be found on the product pages.