These are a set of five Nylatron rocker spacers that replace the side load springs in the rocker arm assembly on your Triumph TR250, Triumph TR6 and Triumph GT6. The advantages of the nylatron spacers is that they keep the rockers arms perfectly aligned over the valve and keep friction to a minimum. Over the years the side load springs wear out and let the rocker arm move around. They are for Triumph cars and not motorcycles.