Simplify the following text for a Grade 7 native English-speaking person.
Original: Like viols , it has a flat back . Intricately carved head at the top of the peg box are common on both viols and viola d'amoures as well ( although some viols lack them ) .
Simplified: Like viols , it has a flat back , a wide rib ( the sides ) , sloping shoulders and a carved head at the top of the peg box .