Thermo Copper Tube 1/4" OD x .051 x 50' Thermo Copper Tube Provides Strength, Precision and Cleanliness Needed For The Demanding Conditions Of Hvac and Refrigeration Applications. Preferred Throughout The Industry, Our Products Have Set The Benchmark For Hvacr Copper Tube. Thermo Tube Is Of A Consistent Dead Soft Temper, Bright, Thoroughly Dried/Dehydrated and Packed In Shrink Wrapping Plus Individual Cartons For The Highest Level Of Protection Nitrogen Purged For Cleanliness. Sealed with or ange Cap To Maintain Cleanliness, Made To Applicable ASTM Standard B280 Made In South Korea