This is the Black Front A-Arms for ARRMA Big Rock, Senton and Granite 4x4's from RPM.

Features:
Fits 3s BLX 4x4 versions of the Big Rock, Granite & Senton
Exclusive 2nd shock mount hole for added adjustability
Replaces stock #AR330443
Adjustability: RPM has added a second shock mount to both front and rear A-arms to the outside of the stock shock mount, adding adjustability and improving trackability. RPM's outer shock mount lowers the ride height, increasing stability on all surface types. A lower ride height also means faster corner speeds.
Durability: Molded from trademark blend of indestructible, engineering grade nylons, you can't get much tougher! They've also redesigned the shape of the A-arms while retaining stock suspension geometry to help improve survivability for those "oops" moments.
Lightweight: With stronger materials and improved designs, there is less unnecessary weight while still offering suspension components that are unparalleled in performance and durability.

Includes:

(2) Front A-Arms, Black
Limited Lifetime Warranty against breakage

This product is compatible with the following Model(s): Big Rock 4×4 (AR102711), Senton 4×4 (AR102668), Senton 4×4 (AR102667), Senton 4×4 (AR102678), Granite 4×4 (AR102665) Granite 4×4 (AR102666) Granite 4×4 (AR102676).