Our Centec series, we were the first to offer sleek European frameless sliding doors to the American market. That paved the way for our upscale Glasstec series and its fully frameless enclosures soon thereafter. By 1990, we brought the high-end, framed Brassline series to market with the richness of solid brass in heavy gauge framed enclosures. Semi-frameless hinged enclosures were added to the Centec line in 1997.