Assertion: sea urchin's spine | /r/HasProperty | 10–12 cm
Facets:
value: in length
type: OTHER
value: usually
type: TEMPORAL
Source sentences:
text: Most sea urchin spines are 1–3 cm, but the spines in this species are usually 10–12 cm in length, and can grow as long as 30 cm in very large individuals.