According to King6Fab " This bushing set is designed as a direct replacement of the stock rubber prop rod bushing. The material used in these bushings a high heat & abrasion resistant virgin Delrin Plastic" which makes the hood rod stiffer. Great for wind resistance for hoods opened at car shows! Carbon Fiber hoods pick up easily. Get them at https://www.king6fab.com/product/hood-prop-rod-bushings/