Your dowsing pendulum is the most personal divination tool you can have. The more you'll use it, the more you'll develop your unique way to practice dowsing. Your pendulum has to be special and inspire you.
Metal pendulums are fantastic tools: heavy, they are easy to use, and require little to none energy cleansing. They are awesome for beginners but depending on their shape, they can also be the best technical dowsing tools for experiences and professionals.