Captains of Crush Grippers are designed and built for performance and 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. Available in 11 strengths for a perfect fit, whether you are just starting off, rehabilitating an injury, or can already crack coconuts with your bare hands. Knurled aircraft-grade aluminum handles, pioneered by Captians of Crush Grippers in 1995. Precision manufacturing for gold standard performance, feel and appearance. Proprietary GR8 springs, only on Captians of Crush Grippers: accurate, precise, and durable. A 20-year history of product development and refinement. Made in the USA. No-surprise geometry, you can count on the consistency and precision of Captains of Crush Grippers. Captains of Crush Grippers provide maximum grip strength in a minimum amount of time.