Sections are normally supplied 'in the flat' and are made up as required. A three sided split type is available, often called the Irish pattern. All are 4-Beeway.  All are 4-Beeway - the bees can access the section from all four sides.
This product, when assembled, measures 108mm x 48mm x 108mm. Available in packs of 10 or 100.
Dampen the grooves when assembling the sections.