Electri-Flex Company offers three types of unjacketed Flexible Metal Conduits that are UL listed and CSA certified. Type BR "Blue Ribbon" is often referred to as "Greenfield" or "Reduced Wall Flex" and is a flexible steel conduit. Types ABR and ABRH are both made from aluminum making it lighter than steel alternatives. ABRH is often referred to as "Heavy Wall Flex" due to its heavy gauge aluminum construction.

• Type BR: "Blue Ribbon" is UL listed & CSA Certifed, a non-jacketed flexible steel conduit with many universal wiring applications. Often referred to as "Greenfield" or "Reduced Wall Flex". Made of hot dipped galvanized steel. Made in sizes 3/8" through 4". 
• Type ABR: Aluminum "Blue Ribbon" is UL listed & CSA certified, a non-jacketed flexible aluminum conduit with many universal wiring applications. Often referred to as "Greenfield" or "Reduced Wall Flex". It is made of a high strength aluminum alloy, approximately 1/3 the weight of RWS. Made in sizes 3/8" through 4". 
• Type ABRH: Aluminum "Heavy Wall Flex". It is UL listed & CSA certified, non-jacketed flexible aluminum conduit with many universal wiring applications. It is made of a high stregth, heavy gauge, aluminum alloy. Made in sizes 3/8" - 4".