Glass Blocks: Building blocks
Blocks are a standard thickness - three inches thick - and available in 7-1/2" squares or 3-1/2" x 7" rectangles. Specially-shaped finishing pieces - called Vetroshapes - with rounded or squared edges can be purchased in matching colors.
Choose from one of three finishes: smooth or two types of satin. Distributed domestically by Vetroarredo Glass Block in Pennsylvania.