Which musical instrument does the character Drew Ballinger play in the 1972 drama "Deliverance"?

Ronny Cox plays Drew Ballinger in the 1972 drama "Deliverance". This is a film where four city-dwelling friends (Jon Voight, Burt Reynolds, Ned Beatty, Ronny Cox) decide to get away from their jobs, wives, and kids for a week of canoeing in rural Georgia.

For amusement, Drew loves to play the guitar. He is very musically inclined and plays his musical instrument (the guitar) when he wants to enjoy himself or just relax. A highlight of the film comes when playing guitar, Cox's character trades musical notes with a backwoods banjo-playing savant boy played by Billy Redden in the harrowing and grim wilds of Georgia.

On the second day of his camping trip, Drew is shot and killed by a hillbilly. Before he is shot, Drew is believed to be a rather spiritual person; he is also seen as a guy with a passion for wanting to be outdoors. He was a loyal friend to Ed Gentry (Jon Voight).

Additionally as a result of the film scene, the instrumental hit "Dueling Banjos" from the movie was a single that reached No. 2 on the Billboard pop chart in 1973.