Open reel construction Imperial and metric measures MT15 - 15 metres or 33' MT30 - 30 metres or 100' MT50 - 50 metres or 166' MT100 - 100 metres or 333' We have the length that you need for any school sport or track and field use ! Lightweight and durable. Open reel construction to allow for sand and grit to drain out and not impede use. One side metric / other side imperial measurements.