The wooden version is Mayfair 128SLOWA 000, and the plastic version is Mayfair 120SLOWE 000. We have the wood, which are firm; the plastic has a little more give, which many folks like. They look great on our Toto Drakes (and a bunch of other toilets in the house). They have the Whisper Close (slow close) function, the Easy Clean And Change Hinges and Stay-Tite attachment system, which works very, very well. (Instead of a bolt from the seat going through the hole and being secured, you insert separate plastic bolts through the holes, which then lock in place without moving. Then, you slide the seat hinges onto the bolt heads, and slide a clip on the seat hinge to the left, securing the seat to the bolt. When you want to clean, you just slide the clips to the right, and pull up the seat, allowing you to clean the whole area. Takes like 5 seconds to remove and 5 seconds to replace.