Bath panels generally come in two types, wooden and plastic. Front panels come in sizes from 1500mm to 1800mm, and end panels vary from 700mm to over 800mm. Depending on how your bath is fitted, you will need 1 or 2 panels. If you bath is in the corner of the room, you will usually need both a front panel and an end panel.
Wooden bath panels can give a more solid feel to your bath, while plastic panels can be easier to wipe clean and can be more flexible.