I've improved the Cone Number Creation Page with a smaller size option 2" x 2 5/8" that fits on Avery #6572 label sheets or Avery #6578 water repellent label sheets. These self stick labels are a little smaller than the 3" x 3" labels and fit on low profile/flat cones:
2 inch number on a 7 in cone
2 inch number on a "flat" cone
I've tested them out on my laser printer and the numbers line up nicely on the labels!
So if you want to DIY your own cones, want to number courses up to 50 obstacles, or need lettered/combination numbers you can Create Your Own Cone Numbers!