Cover for Roho 17 x 17 Low Profile Walkers Specialty Accessori Accepted by leading authorities as Two 1 inch urethane 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 The test is based on heart rate and heart rate variability at rest and personal information * Polar OwnCal© calorie expenditure with fat percentage * Polar OwnCal calculates the number of kilocalories expended during training Standard Replacement Covers for the folowing cushions: * ROHO© Single Compartment (HIGH MID LOW PROFILE) * ROHO© Dual Compartment (HIGH MID LOW PROFILE) * ROHO© ENHANCER© * ROHO© MOSAIC© * The ROHO© Standard Cushion Cover is a textile enclosure intended to protect the cushion * 17 x17 * Low Profile * 6 Month Limited Warranty