Philadelphia Collar W Trach Hole Sm 10 13 4 1 4 H Tilt Tables Accepted by leading authorities as Style:Right Ear Accepted by leading authorities as a simple and accurate method for discovering congenital color blindness and red green blindness each in two forms complete and incomplete * Includes four special plates for tests to determine the kind and degree of defect in color vision * Makes use of the peculiarity that in red green blindness blue and yellow appear remarkably bright compared with red and green * Color plates encased in specially designed album type books for ease of handling * Detailed instructions included Prophylaxis 25 * Collar height 4 1 4 * Contact closure fastener for easy application and adjustment * Can be incorporated into cervical casts and is X ray translucent * Offers better limitation for rotation and extension than foam collars * HCPC Code: L0172 WITH TRACH HOLE * SIZE: Small MEASUREMENT COLLAR: NECK 10 13 HEIGHT: 4