Bought six of these as a trial for use at indoor recreation centre. We use Onix fuse indoor balls, and have settled on orange as the only colour visible enough in our facility to please everyone. However, Onix balls are expensive and not very durable, cracking after only 10 hours of use. The Churco balls play much the same as the Onix, but are much more durable. I suspect they will never crack, but will have to be monitored for soft spots. We will order 50 Churco balls when we finish cracking the rest of the Onix balls we have.