• Add weight to the wheels each, which lower the vehicle's gravity and increase the stability.
• Greatly help to the wheels grabbing for the vehicle more capable crawler.
• Precise dimension control to make it easy to install the bearings, and run smoothly.
• More options to tune to 
your taste.
• High quality CNC machined brass material.
• Fit Axial Capra 1.9 UTB F9 Portal Axle and SCX10 III AR45 Portal Axle
• Fit Vanquish Capra Currie F9 Portal Front Axle (Portal Weight Set A B C D E)
• Fit Vanquish SCX10-III Currie F9 Front Axle  (Portal Weight Set A B C D E)
• Fit SuperShafty "CP44" Front Axle (Portal Weight Set A B C D E)