Humm Line
Scare birds off moored boats
Stretch tightly between two supports and even a gentle breeze will cause Humm line to vibrate, giving off a sound which birds cannot tolerate and stopping them from fouling decks and cockpits.
Secure the tape to the forestay about 1 metre above the deck and stretch tightly to the shrouds and backstay
30m of 5mm line
No harm is caused to the birds