I have used other things in the past but found they can be flimsy and can also have annoying lips, rims and ridges in the worst places which can lead to needle breaks.
All my felting templates are made with a 2mm thick wall which holds it's shape. The walls are flush and straight so no nasty lips to catch your needles on.
This set contains : 4 templates
A Top Hat
A Cog / Gear
A Bow Tie
Create countless crafty projects with this set .. such as .. Steampunk Xmas Decorations | Wearables | Papercraft Card Toppers | Garlands and more...
Take a look at the tutorial: