Resonator ukuleles generally utilize a "National style" single-resonator biscuit cone, although a small number (including those made by the Dobro company in the 1930s) use a bowl resonator and spider cone.
 Tricone resonators, such as seen in many National resonator guitars and mandolins, are not generally used.
 Note that the term "Triolian" which National applied to some models of resonator ukuleles does  not indicate that said instruments used a tricone resonator.
 
Since the majority of the instrument's tone is produced by the resonator rather than the body, resonator ukuleles may have bodies made of metal, fiberglass, or wood (solid or ply).
 Metal bodies may be brass, aluminum or steel.
 Both metal and wooden bodies are often painted, or wooden bodies may be stained or lacquered.
 Metal bodies may be plated or plain, and are sometimes engraved.
 Several makers also offer metal-bodied reso-ukuleles with an artificially aged or rusted surface.

Resonator instruments may have round sound holes with screens or cut f-holes at the top of the face,  or a hole cut into the side of the body angling up towards the player's face, through which the sound of the instrument issues.
Resonator ukuleles generally utilize a "National style" single-resonator biscuit cone, although a small number (including those made by the Dobro company in the 1930s) use a bowl resonator and spider cone.  Tricone resonators, such as seen in many National resonator guitars and mandolins, are not generally used.  Note that the term "Triolian" which National applied to some models of resonator ukuleles does  not indicate that said instruments used a tricone resonator.  
Since the majority of the instrument's tone is produced by the resonator rather than the body, resonator ukuleles may have bodies made of metal, fiberglass, or wood (solid or ply).  Metal bodies may be brass, aluminum or steel.  Both metal and wooden bodies are often painted, or wooden bodies may be stained or lacquered.  Metal bodies may be plated or plain, and are sometimes engraved.  Several makers also offer metal-bodied reso-ukuleles with an artificially aged or rusted surface.
Resonator instruments may have round sound holes with screens or cut f-holes at the top of the face,  or a hole cut into the side of the body angling up towards the player's face, through which the sound of the instrument issues.
Resonator ukulele