This type of ball is easy to distinguish because its outer material is similar to the material used on tennis balls. They normally are a size 5 and similar to the outdoor soccer ball. Indoor soccer balls are purposely designed with less rebound in order to accommodate turf and harder surfaces that cover the walls of an indoor soccer field and playing ground.
I bought this ball for a non-traditional use: my miniature donkey LOVES to roll and toss balls, and slightly deflated soccer balls seem to be easiest for him to grab. We've had this one for several months now, and it has withstood his rough play extremely well. In fact, I'm back to buy another so we have a backup in case our first gets lost. I definitely recommend!
Size 5 is the official size for professional matches. Therefore, this ball is only available in this size. Do not use this soccer ball on concreted areas. Its unique rubber uses Puma Airlock Valve Technology (PAL) in order to facilitate proper airlock technology. This ball features Perimeter Balance Technology (PBT) which enables it to maintain impressive flight characteristics. https://www.youtube.com/watch?v=j2Xn84L3Kcs