... .With 4.5*6mm chain 3.The track for the control have single side Velcro Roman blind control unit1.POM,Plastic and Aluminium 2 ... .1set/bag,25sets/CTNName:Roman blind A set components/system-control unit,curtain chain,metal bracket,tape roll,head track,cord ... in one carton B setC setC set Roman blind components-control unit A set for roman blind,roman shade accessories