... 4.5*6mm chain 3.The track for the control have single side Velcro Roman blind control unit1.POM,Plastic and Aluminium ... roll,head track,cord,coe rod,roman blind rings for roman shade curtain,curtain accessories,Roman blind curtain designNO:ZH-C011.Material:POM ... with our plastic components8.Different model/style of blind components offer different choice for usersPacking:One set in a plastic bag,25sets ...