Decorative drink coasters for the mid-century modern enthusiast. These coasters are inspired by the patterns that are found in mid-century architectural breeze blocks. Breeze Blocks, or Architectural Screen Blocks, are a decorative concrete block used for architectural screen walls and fences. They have been around since the 1930s and became hugely popular in the Mid-Century Modern residential & commercial buildings of the 1950s & 1960s. These retro coasters measure 3.9 inches in diameter, are created using the latest in 3D printing technology and are made from 100% biodegradable, PLA Filament. PLA Filament is a nontoxic resin made of sugar derived from field corn. Note: The Laser cut orange option is not 3d printed but is laser cut from 3mm acrylic. This item comes in a set of four coasters and is also available in white, black and gray.