You should choose your slackline based on your level of skill
Level of Skill
You will choose a slackline with a thin (2,5cm) and long (25m) strap, or a model designed for jumps, with a wide (5cm) elastic strap.
You will choose a more advanced product with a wide (5cm) but longer (25m) strap that will enable you to increase the length when improving your skill
You will choose a slackline with a wide (5cm) and rather short (13m) strap