I genuinely thought this was a joke post but if you are serious then it is a disc lock that goes in the front wheel disc and the loop goes on the handlebar grip to remind you it's fitted
Does this link help, if you're serious? https://www.abus.com/uk/Consumer/Motorbike/Brake-Disc-Locks-Motorbike/GRANIT-Victory-XPlus-68 Tom.