Answer :
stretch all with a weight.
e.g. stretch 1, 2 and 3 with a 10g weight. if does not break, proceed with a 20g, the 30g consecutively. last one which holds the heaviest weight is the most durable one.
e.g. stretch 1, 2 and 3 with a 10g weight. if does not break, proceed with a 20g, the 30g consecutively. last one which holds the heaviest weight is the most durable one.