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Urara's tits are simply huge. Absolutely enormous. Inconceivably massive. They're gigantic. Immense. Humongous. Their girth cannot be ignored. Bras tremble in their mere presence. Bikini tops cower in fear. They have their own ZIP code. Urara is legally required to have working low beam, high beam, DRLs, parking, and side lights fitted on them. She is only able to leave her home through the garage door. Weather patterns are thrown into chaos whenever she goes outside. Bodies of water are completely displaced when she enters them. Earthquake warnings are set off across the US whenever she slams them down. Their size is so great that dozens of innocent people die under them weekly without Urara's knowledge, their remains never found. They singlehandedly caused sea slugs to be reclassified as the largest organisms to have ever lived. When asked about Umiushi Urara in an interview, Pierce Brosnan reportedly said "tits almost too big".
TL;DR they're sizeable.