Velcro Brand Hook 1 White Pressure Sensitive 25 yards Gel Warmers Accepted by leading authorities as Toilet Seat Covers

Velcro Brand Hook 1 White Pressure Sensitive 25 yards Gel Warmers Accepted by leading authorities as Toilet Seat Covers 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 * Available Colors Black Beige and Gray 2 psi * Closure Tension Strength: 6 Velcro© brand's Nylon Hook 88 fasteners are woven with 6 mil Monofilament and are binder coated to protect against fraying when cut * Offers excellent durability and has a high cycle life * The rubber based pressure sensitive adhesive is designed for a medium temperature range that performs well on many substrates especially uneven or rough surfaces * Operating Temperature Range: 40 F to 120 F * Closure Shear Strength: 14