Transparent dust extractor hose 100mm (4") internal diameter. We have now upgraded to a Polyurethane product which is 5 times stronger than the traditional PVC. Its transparency enables blockages to be quickly identified and cleared. The hose has a steel wire helix to keep its strength and shape. Please note; The hose will be compressed during shipping. When unpacking hose please stretch it back to full length and allow it to relax for a while before confirming the length. The hose is measured in a fully stretched position.