*  Simple enough to be rolled around and played with by people of all ages, as well as dogs, cats, monkeys, etc. 

*  Contrived as being an integral component in everyday machinery and transportation (usually part of a greater whole, as in a ball-bearing set or assembly).

*  Hazardous to slip or trip on, to swallow or choke on, or if thrown. 

Thus, a name for these may well be "SPHERICOLLISION" 

*  Please obtain yours and stand, sit, & lay down with 'spherules' rolling in hand for your own aural & harmonic friction experience.