These endlinks are a solid design, and are CNC cut and hard anodized from 6061-T6 aluminum materials and will come provided with durable urethane bushings for the proper amount of dynamic flex. 
These are direct replacements for your factory end links that will become weak over time and mileage and the Kartboy units will improve the handling of your vehicle in high-performance driving conditions. 
Sold as a pair, and hardware will be included to make these endlinks ready for the installation.