M seal is the adding weight type,M seal is like a rubber, or you can say its like clay, when armature revolves and machine says that put mseal to balance at particular area,

Remove weight type, the difference between auto and semi-auto is:
1. Semi auto do the balancing in one machine, then remove weight in another machine,
2. Fully Auto do the balancing and remove weight automatically,

Drill type have lower efficiency, we don't produce