Assertion: rubber bowling ball | /r/MadeOf | light density inner-fillers
Facets:
value: at the center of the ball
type: LOCATION
value: usually
type: TEMPORAL
Source sentences:
text: Instead, they usually contained light density inner-fillers at the center of the ball, along with a weight block near the ball’s surface which could be tweaked in its layout to modify a ball’s preferred lane path.