It is for both side because the rest base angle can be adjusted. I chose resin version which I believe is more drop resistance. I just received my 2nd set. Now I got two umbra standard support for my two guitars.
Antonio Picado Model 60 Spruce 2017
Esteve Mod 1.4ST Spruce 2003
Ryoji Matsuoka M20 Cedar 1978
M.Sakurai No.5 Cedar 1976