Here are some of the reasons you may want to use them:

Diameter: 36

giving you replacements for a broken or worn arm without needing to source parts individually

window mask sheet

It's a direct-fit hop-up for the Enduro

Arrma Main Diff / Differential Gear 39T Spiral Kraton 4X4 8S Outcast 8S Extensions Here are some of theArrma ARA310911 Main Diff Differential Gear 39T Spiral Kraton 4X4 8S Description Genuine ARRMA 39 tooth spiral cut main differential gear designed as a direct replacement for select ARRMA 1 5 scale 8S vehicles. Manufactured from tough steel, this precision cut gear provides smooth operation, dependable power transfer, and long lasting performance under extreme RC conditions. Features Genuine ARRMA replacement part Part number: ARA310911 39 tooth main