These little sling labels can prevent costly damage to boats being hauled out by travel lifts. They show the travel lift operator where to position the slings to avoid propeller shafts, saildrives, speedometer transducers, etc. Slings should also be positioned where bulkheads support the hull. 

These labels are stickers, so they will conform to the curve of the boat's sheer.  They are durable little labels - I've had a set on my boat for 4-5 years, and they look just like they did when they went on. They are sold individually - 4 are needed per boat.  Size is 1.5" x .5" Rectangular.