This Trimmer was manufactured Feb 2021 by MTD for Craftsman.
The 25 CC two cycle engine runs on a 50 to 1 gasoline to oil mixture.
Cutting shaft attachment shown in the picture has a head where you install two precut string lengths.
If you don't want that attachment, you can choose one of the other two I have.
Curved attachment that has the wind up bump head.
Straight shaft attachment that has an 8" blade.