Quality and size: The plastic roller of quality material you won't worry about ruining your beautiful curtains; The dimensions are approximate.The wheel diameter of the 11 mm curtain rail is 11 mm What do you get: can you get several curtain track rollers (not including long tracks) to fit large curtains specific quantity for your choice as well as use for each of your houses enough numbers to also give away to your family and friends Smooth sliding: these curtain track rollers can roll freely and slide smoothly inside the track; Curtain rails are applied in a variety of track shapes and slide very smoothly Versatile use: this ceiling flexible curtain rails look nice in most environment; Curtain tracks make good room compartments window decorations shower tracks trailers or most compact space that increase your space giving you instant privacy Simple installation: easy to use check the suitable size of your home for installation suitable for beam curtain track; The carrier easily moves from track to track from open to close