Some many people do not know where the centre of gravity is on their mast and where it is safe to lift from. It’s much easier to find points lifting in the Spring, and put these stickers on then to take the guessing out of the equation for unstepping in the Fall.
Al Hansen has ordered 100 of them to test out and Roland van Hazel or Al will be handing them out in the yard. He has ordered some that are 1” in diameter (big enough to find if you know it is there, but not small enough not to deface the mast). It may be a little late for the first few boats.
Please look to Don Weston, Al or Roland for the labels or to ask questions.