The Marcy Wedge Forearm Developer builds your flexor and extensor arm muscles using one simple motion. You can adjust the foam grip for a comfortable fit and adjust the resistance to take your workout to the next level! A Comfortable Fit Don't deal with an uncomfortable fit, use the small red knobs shown to adjust to fit any forearm. In the early 1940s, Walter Marcyan began entertaining audiences as a Vaudeville Strongman, performing incredible feats of strength and balancing acts... the legendary Marcy brand continues to make its mark by offering new and innovative products to consumers worldwide. Patented designs were years ahead of their time and still widely used in commercial and home applications today.