If you're dealing with tennis elbow, golfer's elbow, or just need to rebuild hand and wrist strength, these Vive therapy bars are incredibly effective. The 3-pack gives you five different resistance levels by combining the bars together - you start with the individual bars for light resistance, then slide the thinner ones into the thick bar for heavier workouts. Made from latex-free TPR material that's durable but still flexible, they withstand all that twisting and bending without breaking down. The textured surface with soft ridges gives you a secure grip that won't slip, even when your hands get sweaty. Each bar is 12 inches long - the thick one is 2 inches in diameter, the thin ones are 1.25 inches - so they're easy to store or take with you. Whether you're recovering from surgery, dealing with tendonitis, or just want to improve your grip strength for sports, these bars provide that progressive resistance that actually produces results. The 60-day guarantee gives you peace of mind too. Much better than those cheap rubber grip trainers that don't provide consistent resistance.