This is the Battery Tray Set for the Arrma Outcast 6S BLX.

Stock replacement battery tray set for the Outcast 6S BLX
Accomodates batteries up to 1.89" (48mm) wide, 6.22" (158mm) long
and 2.76" (70mm) high
Composite plastic construction
Balance plug stowage area secures balance plugs with a rubber strap
keeping them away from rotating parts
Wire routing clips fit to strap and keep battery to ESC wires secure

Battery Tray and Upper Brace
Receiver Box Brace
Wire Routing Clip
Long and Short Hook and Loop Straps
Balance Plug Retaining Strap
Two Battery Box Pins
Two M3x5mm Flat Head Screws
Five M3x8mm Flat Head Screws