E10-E30 for Marimba are high quality wool and nylon blend yarn that covers a rubber core and features natural birch handles. These produce a warm, round tone. E10 is a soft mallet, E20 is a medium mallet, and E30 is a hard mallet.
 
E40-E50 for Vibraphone are high quality and durable cord wrap that cover a rubber core and features natural birch handles. E40 is a medium mallet, and E50 is a hard mallet.
 
E60-E70 for Xylophone feature natural birch handles, and a full 1 1/8" rubber head. E60 is a medium mallet, and E70 hard mallet. 
 
E80 is ideal for the beginning percussionist to use for a Bell Kit or Xylophone. It features natural birch handles, and a standard poly ball head.
 
E90 is a mallet for Bell Kit or Xylophone. It features natural birch handles, and a standard PVC head.
 
E100 is a mallet for Bell Kit. It features natural birch handles, and a standard brass head.
 
ET90B -ET100B are super durable hemp cord wrapped around oval rubber cores and also have flexible rattan handles. They are extremely durable, and project a great tone and attack. These are part of the Earth Tone Series for Vibraphone or Marimba. ET90B is a medium hard mallet, and the ET100B is a hard mallet.