About: roller ball

Premodifier: roller
Head noun: ball

Same concepts
http://dbpedia.org/resource/Rollerball

Broader concepts

label	provenance	confidence
device	isap:302535289	0.744806
instrument	isap:188885879	0.343220

Narrower concepts

label	provenance	confidence
pen	isap:251368359	0.202315