This is a roll of Tri-X Pan 116 Film from Kodak that produces 2.5 x 4.25" negatives. 116 is an older film format that has a slightly slimmer spool and is normally associated with older, collectible cameras. Officially, it was discontinued in 1984. The model of camera you are using will determine the number of shots you get from the roll.
Produces 2.5 x 4.5" negatives (nominally 6.5 x 11 cm)
Number of shots per roll depends on camera you are using