Hi I just wanted to know if there were limitations on the amount of string that could be used on the robot and size
Is there a limit on the amount of string that could be used and size
Rule R7 e. tells you everything you need to know about this. You can use as much as you like as long as it is nylon and 1/8", approximately 3mm diameter.
You’ll find R7 on page 25 of the game manual (https://content.vexrobotics.com/docs/vrc-tower-takeover/GameManual-20190816.pdf), along with a bunch of other useful information about the robot requirements. It’s a good read!