The Mass Self-Aid Kit motivates or polishes ALL production or residential building to double its production for one collection (for production buildings, this can be done even after production finishes)
The Self-Aid Kit and Mass Self-Aid Kit were introduced with the 2017 changes of the Guild Expeditions.
On 18th Feb 2018 (BETA), the Mass Motivation Kit was revamped into the Mass Self-Aid Kit. This now enables the player to motivate or polish all buildings of his/her city. THIS WORKS EVEN AFTER PRODUCTION FINISHES (on production buildings).