The standard 140 mm face ensures clean, even lines without looking heavy. Four square holes run through the core; with flat upright walls taking the load, the profile resists bending and keeps its shape under years of foot traffic. At 25 mm, it sits at the optimal balance point: noticeably more substantial than a 24 mm board, but lighter and more material-efficient than a 30 mm one. This makes it easier to ship, faster to lay, and less demanding on your sub-base.