Urea-formaldehyde white square toilet seat. Urea-formaldehyde toilet seat cover is easy to clean and sturdy and unbreakable. White is a very classic color and he is suitable for most bathroom decorations. If you do not know how to choose, elegant white color is the right choice for you. Square toilet lids are also a very common type of toilet lid. The square shape also makes the toilet lid more stable and less likely to wobble. Square edges are also easier to clean and less likely to harbor dirt.