Generally speaking, aesthetic designs relate to the appearance or eye appeal of an article. Features which are necessitated by the function of an article may be registrable as "functional designs". Spare parts are however not protectable by function designs but may be by aesthetic designs.
An aesthetic design lasts for up to 15 years, and a functional design lasts for up to 10 years from the date of application.
In order to keep a registered design in force, annual renewal fees are payable from the 4th year onwards. A registered design cannot be extended beyond its full term.
In order for a design to be registrable - it must be new and original (aesthetic design); or new and not commonplace (functional design).