The seat on my head broke. It is 3/4 the size of a house toilet, made of MDF and plastic, just like at regular seat. But WM and every other vendor I have found want $80.00 for a replacement! The most expensive (full size) seat you will find at a hardware store is $30.00 (with brass hinges), and most are $10.00 to 15.00! This is the best example I have encoutered of how vendors screw boat owners. It's an excellent example, because there is a direct example in the real world. I did find a reasonable seat listed here: Whale Point Marine & Hardware Co.. Sadly, I already got ripped off at WM.