Long grey tubes

Long grey tubes

Observation - Long grey tubes. Description: This was on the underside of a blue plastic barrel used as a yacht racing mark in Strangford Lough. Any idea what the long grey tubes are? I didn't notice them at the time and so didn't check them out - it's always possible that they're bungees!

This was on the underside of a blue plastic barrel used as a yacht racing mark in Strangford Lough. Any idea what the long grey tubes are? I didn't notice them at the time and so didn't check them out - it's always possible that they're bungees!