The performance of the rubber of the black ring fixing the mesh is bad and it stretches quickly. Because it is a direct cab, it may be better to change to rubber with oil tolerance. At present, rubber and mesh part are fixed with a gasket and used.
I bought it for NSR 250 R MC 28. Since the air clean BOX disappeared, it was refreshing. Although it is the direction of feeling, it seems that it will not change much ,,,, As the rubber part of the filter seems likely to deteriorate, I applied silicone grease before installation. Durability is now.