This is the Team Losi Racing 5mL bottle of TLR-LOK Blue Threadlocker.
 
Features:
Prevents threaded fasteners, nuts, bolts and screws from loosening
Can be removed using normal hand tools
Ideal for clutch screws, motor mount screws, shock piston screws, or anywhere that screws meet with metal
TLR's removable threadlock
Withstands vibrations
Keeps air, oil and water out