K&N Filter Wrap Drycharger Oval Tapered Black - 3.75in Base I/S Width x 3in Top I/S Width x 4in HK&N SnowCharger filter wraps are the pre filter answer to all the snow that wants to pack down into the pleats of your snowmobile air filter. SnowChargers are silicone treated polyester wraps that repel snow and water. Melting snow just beads off instead of soaking the filters. SnowChargers also deflect all the grass, twigs, rocks and dust you encounter when grass track racing or crossing snowless trails. SnowChargers offer minimum restriction.