The victim, Yogesh, was rushed to a nearby hospital and later discharged, they said.
A case has been registered and it is being probed whether it was the banned Chinese manjha that cut the biker's neck.
The National Green Tribunal had recently imposed a complete ban on manjha made of nylon or any synthetic material which is non-biodegradable, saying it posed a threat to the lives of birds, animals and humans.
A bench headed by NGT Chairperson Justice Swatanter Kumar had directed all state governments to prohibit the "manufacture, sale, storage, purchase and use" of synthetic manjha or nylon threads and all other synthetic threads used for flying kites.