Hey John,

They are rubber. Before I put them in the freezer they had more "give". Putting them in the deep freeze made them shrink but now they don't "give". Trying to install them on the spring bracket, I can get them all on and once the bottom washer goes on I no longer have room to get the nut started. I had clamp that I use to do wood work and tried to use that but the end link kept wobbling and I never could get a strong enough clamp down on it.