After a couple of decades, the corks inside my Carlisle whitewater oars dried up and fell out. The corks keep the oars from filling with water and sinking. I had to shave/sand down the size #24 corks into a cylinder shape so they would fit snuggly inside the oar shafts. It worked perfectly! I was so happy to find the right size corks at a great price! The shipping was quick, too! Thank you!!!