High quality elastic cords for your Mantor-Restorer device. Each device has 3 cords which makes it 1 set.
From our experience the cords should be replaced after an average of 4-6 months, depends on the intensity of usage.
Pack of 9 cords = 3 sets of replacements. Enough for at least 1 year of tugging
Pack of 18 cords = 6 sets of replacements. Enough for at least 2 years of tugging.