Page "Pole vault" Paragraph 18
from
Wikipedia
Because pole stiffness and length are important factors to a vaulter's performance, it is not uncommon for an elite vaulter to carry as many as 10 poles to a competition.
The effective properties of a pole can be changed by gripping the pole higher or lower in relation to the top of the pole.
Poles are manufactured for people of all skill levels and body sizes, with sizes as short as 3. 05m ( 10 feet ) to as long as 5. 30 m ( 17 feet 4. 5 inches ), with a wide range of weight ratings.
Each manufacturer determines the weight rating for the pole and the location of the maximum handhold band.
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