This is a silicone sealing tool which is used to seal holes/gaps on your electric skateboard . We use this on ALL Meepo boards to make sure its a secure fit and and better sealing.
The gun comes with 2 plastic bars includes already
The gun gets hot, and the plastic bar turns into liquid, and you drop it on the gaps to seal the hole.
Then the plastic will harden and stay in the gap, thus the gaps are sealed and protected.