Gas and electric hobs will either have enamel, stainless steel or ceramic surfaces. Ceramic surfaces are available for gas hobs but are mainly used for electric hobs.
Hobs with enamel surfaces are available in a variety of colours. Ceramic hobs have a black surface but their frames are available in a wide selection of colours. Stainless steel surfaces do not offer variety in terms of colour although the stainless steel may be brushed which offers two alternative effects.
These are used on ceramic surfaces where the controls are placed under the glass. These are activated through the light pressure being applied by placing a finger on them.