ALUKAP-XR standard bar and ridge gaskets provide cushioning for glazing along the rafter in 1m lengths. Manufactured from rubber, theyre pre-lubricated to help with any unnecessary friction, expansion or contraction.ALUKAP-XR is a weather-resistant glazing bar system from Clear Amber that sits atop rafters for a clean, attractive finish. The sturdy and durable system comes in a range of profiles and finishes, in both white and brown so you can match the rest of your building or surroundings with ease. Compatible with timber rafters, the fixings for ALUKAP-XR are concealed and made from aluminium like the rest of the system so youre assured quality and neat installation. Decorative finishing castings are also available so you can bring even more style to your system.