1) Starting April of 1998, the SL-17and MK-21 will ship as standard with a new, vacuum formed ABS visor, DSI Part # 520-054which replaces the older fiberglass visor DSI Part # 520-064.
2) Starting April of 1998, the KMB 18 Band Mask will ship as standard with a new vacuum formed ABS comfort insert, DSI Part # 520-051. This insert replaces the older fiberglass insert, DSI Part # 520-050.