The She-e Wu Concerto Marimba Mallets from Innovative Percussion feature four mallets of varying hardness.

WU4C:  Medium Hard Concerto Marimba Mallets
WU5C:  Hard Concerto Marimba Mallets
WU6C:  Very Hard Concerto Marimba Mallets
WU7C:  Extremely Hard Concerto Marimba Mallets

• Plastic cores to create a bright tone quality
• Available with hand-selected unfinished natural birch or rattan handles
• Tightly wrapped with durable and organic bamboo yarn