Almost all Gibson basses have mahogany necks. T-Birds, EB-0 (SG shape), EB-1, EB-2, EB-3, Les Pauls and many of their new models as well. The only maple necks were typically on Grabbers and Rippers in the 80's. I'm sure I've missed a few models, like the RD and Victory, but these are the main ones.