Latest state of the art Klinger material gasket to help prevent oil leaks. Measures 31 thou or 0.81 mm thick but compresses to correct size when fitted. Using latest gasket technology to eradicate leaks it is the best available not requiring any sealant and torqued to 18lbs.ft. The manufacturer believes its an overkil to use Klinger material on a mini but they are not aware of how the mini leaks oil-Rover did however realise the problem and started using this type of gasket on the MPI models from 1997 on where they did not want expensive on labour warranty costs.