The X series is truss with comparatively thin walled main chord tubes (2 mm), which is designed for use in permanent or semi permanent installations; for example, decorative and architectural set pieces, theatre sets, shop displays, studio grids, showrooms etc. The X-series are also very commonly used by rental and exhibition companies.

Prolyte supplies a variety of X/H30 elements that provide maximum flexibility:
- 3 types; ladder, triangle, square
- several lengths, standard or custom
- circles or arches
- box- & book-corner system
- several standard corners
- several accessories
- custom made pieces
- colour coating