Mandolinists such as Avi Avital and Joseph Brent use them , and they are custom instruments , today .
The double top is a feature that mandolin makers are now experimenting with in the 21st century , to get better sound .
Mandolinists such as Avi Avital and Joseph Brent use mandolin makers , and they are custom instruments , today .
The double top is a feature that mandolin makers are now experimenting with in the 21st century , to get better sound .