There is bungee cord and there is shock cord. The tanglo uses shock cord! Shock cord will out last the rubbers used by Zinger and Guns up. It will not be affected by the sun as much. Cost is the reason GU and Zinger uses the surgical Rubber. Real good shock cord cost around $2.00 compared to fifty cents for the rubber cords but here again you get what you pay for. Shock cords are the best by far! Rubbers you change at least once a year or more depends on the exposer to the sun. Important to know the pully size and then buy the right size. If you have a Zinger or GU do not use shock cords it is too strong for them and will damage them.