Final answer:
The synthetic sling should have the manufacturer's instructions and warnings permanently affixed to it, providing crucial information for safe use.
Step-by-step explanation:
The question pertains to what should be permanently affixed to a synthetic sling used for lifting loads. Such slings must be regularly inspected for any signs of damage or abnormal wear. Alongside these safety checks, it is important that the sling have the manufacturer's instructions and warnings permanently affixed to it. This ensures that anyone using the sling can readily access critical information about its use, maintenance, and any safety precautions that must be followed to ensure proper and secure operation.