I am wanting to start banding my chicks and then chickens. I've found the numbered and colored ones in appropriate sizes but how easy are they to get on and then off? Is there a tool I need or are they super stretchy and easy to get on and off? Or are the metal ones better? I like the idea of the bright different colors and numbers so you can identify somewhat at distance so that is my preference but have never used them before and don't know the upside of either type. Any input is appreciated.