This is a replacement Arrma Differential Case Set.

Features: 

• Super-tough composite Diff Case for long-lasting performance in all conditions 
  
• Precision manufactured Metal Cross Shafts Inserts for increased durability under extreme loads 
  
• High-quality Screw threads for consistent servicing 
  
• Specially designed Diff Case Insert for increased strength and durability

Includes: 

• (1) Diff Case
• (1) Diff Case Insert
• (1) Diff Gasket
• (4) Button Head Screws - M3 x 12mm
• (1) Set Screw M4 x 3mm