In construction, there is an increase in the use of "one-way" fabric slings. These are normally Polyester, manufactured to EN 1492-1 (similar to normal slings), with the normal 7:1 Factor of Safety?

So the question is: what is different about these slings, compared with a normal sling, that makes them only suitable for one use (or one trip).

Does anyone know if these single use slings are marked differently, such as a different colour or marked as single use in the braiding? My concern is that they could be used again accidentally by a third party who does not realise they are one use only.

Perhaps if these slings become a standard, then maybe somebody should cut them in half immediately after use to ensure they are not used again. Perhaps another job for the delivery driver; collect and cut slings and return to base.

Also, just on a commercial issue, these one time only slings seem to me to be an extravagant extra cost to a products cost (assuming the item cost comes with the sling cost inclusive of the packaging), surly using the standard multi-use slings would be both cheaper and safer in the long term?