B&K 1/4"x10' Copper Refrigeration Tube. Streamline copper tube offers strength, precision, and cleanliness for HVAC and refrigeration applications. Nitrogenized ACR copper tube is pressurized with nitrogen to prevent harmful oxide formation during brazing, reducing system contamination. Consistent dead soft temper, bright, thoroughly dried or dehydrated, and packed in shrink wrapping plus individual cartons for optimal protection.