BRAND NEW Replacement Sinclair QL Membranes - The main problem with keeping any Sinclair computer running is the availability of keyboard membranes , which are the main cause of key failure on the Sinclair Computers. We can supply to you these BRAND new QL replacement membranes to allow you to repair your QL. These have been manufactured using the latest technology and are heat and ultraviolet light resistant, which should see the QL working for at least another 10 years. They are very easier to fit.