Timber sliding sash windows comprises two parallel rigid flippers which are friction free, ensuring smooth movement of the sash whilst maintaining a constant high level of protection against the elements. Not affected by paint or stains - paint will not bond to the rigid flippers, they are rooted in resilient material ensuring they retain the correct weather proofing positions. Patent design - The two parallel rigid flippers are friction free. Aesthetically pleasing appearance similar to a moulded timber bead. Available in 3m Lengths white or brown.