Captains of Crush Grippers: designed and built for performance. Known around the world as the gold standard for building and testing hand strength, Captains of Crush Grippers are the single most important grip strength tool you can choose- for the fastest route to the strongest grip. Knurled aircraft-grade aluminum handles, pioneered by CoC Grippers in 1995. Proprietary GR8 springs, only on CoC Grippers: accurate, precise, durable. A 20-year history of product development and refinement. Precision manufacturing for gold standard performance, feel and appearance. Made in the USA. No-surprise geometry: you can count on the consistency and precision of Captains of Crush Grippers. Captains of Crush Grippers: Maximum grip strength, minimum time. No. 2: Master the No. 2 if winning or losing- or living or dying- might depend on your grip strength. When you get to the No. 2, you're in the realm of extraordinary grip strength, exactly what you need if your life, or someone else's, depends on how strong your hands are. Note: Due to the light and screen setting difference, the item's color may be slightly different from the pictures. Please allow slight dimension difference due to different manual measurement.