Topeak dual side frame clip on pannier supports for the topeak popular mtx and ex beam racks extend your range with these lightweight supports features tough 6061 t6 aluminium construction attaches to topeak mtx ex beam racks in seconds perfect for using topeak mtx trunk bag with panniers weight 300g please note seatpost mount bracket not included just pannier racks buy topeak accessories from chain reaction cycles the worlds largest online bike store