Unifilter Air Element Honda CR250 1979.  Australian Made 2 Stage UniFilter, Unique Saw-Tooth outer Layer for maximum surface area, 50% more than any other filter.

These filters have a longer skirt than the original filter, which had a stitched leather band, and is secured with cable ties instead of the original hose clamp this is to make installation easy and reduce the chance of damage to the foam while providing a seal which is effectively better than the original