The Thumb Killer (aka "Thumb Killer") — a must-have in arm wrestling workout equipment. Compact (1.25” x 4”) with 2 bands, built to target and strengthen your thumb anywhere. Great for training, therapy, or fidgeting—simple, intense, and effective.
(1) GD MICRO aka the "Thumb Killer" (2) Resistance bands Size: 1.25" wide, 4" long