Siri's Saga 10-Year Anniversary Edition Series is an omnibus of both The Hardcore Series and The Hardcore Novels. 

Undeniable dimensions: 5 x 0.92 x 8 inches - 368 pages

Untouchable dimensions: 5 x 1.21 x 8 inches - 482 pages

Unstoppable dimension: 5 x 1.08 x 8 inches - 432 pages

Undone dimensions: 5 x 1.04 x 8 inches - 414 pages

Unforgettable dimensions: 5 x 0.96 x 8 inches - 384 pages