The test to determine the fall count uses a 5.1m rope and drops a weight (80 kg single rope / 55 kg double rope) so that it falls 4.8m before experiencing a reaction force from the rope. This means that the weight is falling below the fixed end and there is minimal rope to stretch and absorb the force. The fall count rating is the number of times the rope can undergo this test before breaking. For the dynamic rope to be UIAA certified it requires a fall count rating of 5 or more.