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What are the main differences between the blum metaboxes & tandem boxes. Is it just the soft close? Are the drawer bases the same strength? Thanks
    Blum Metabox runs on visible nylon rollers. 
Tannembox mechanism is fully enclosed and runs very smooth and silent. 
Both have 16mm or 18mm thick base panels, and are very sturdy.
Tandembox runners can be upgraded to 50kg weight capacity.
The video on our homepage clearly shows both versions in action.