Super Parts Air filter for Stihl MS290 MS390 MS310 029 039 Chainsaw replaces 1127 120 1621 For Stihl 021, 023, 025, MS210, MS230 MS250 chainsaw Replaces P/N: 1123 120 1612 / 1123 120 1613 Repalce : 1127-120-1620, 1127 120 1621 Act as a direct replacement, just same quality as the OEM parts Made with high quality, durable to use