Belgard Hardscapes has introduced its Mega-Tandem Mass Retaining Wall block, which allows for building reinforced walls up to 15-ft.-high and gravity walls up to 10-ft.-high without reinforcing. The system features a positive mechanical connection. The reinforced polypropylene connecting members create structural integrity in curved or straight retaining and freestanding walls. It is available in a 12- by 24-in. panel and weighs 65 lbs. and has a running bond configuration so no patterns are required.