With embossed polyethyene film, climate resistant foam, and 3/8 inch thickened insulated cotton, this three-layer insulated mini split copper line set is corrosion-resistant, fireproofing, flame-retarded, thermal insulation, waterproof, shockproof, sound absorption and durable. The insulated copper twin line set has been successfully tested by Method ASTM G154. No cracking at low temperature of -40 ° F, no deformation at high temperature of 248 ° F, ultra wide working temperature range, and can cooperate with all kinds of refrigerant operation。Pre-flared ends with nuts are for simple and easy installation. Copper coil line set fits most ductless mini split air conditioners and heat pump systems. 1.10 Ft. copper tube showing no leaks with high and low pressure twin lines. 2.Universial Size-Standard size 1/4" & 3/8" outer dimension copper pipes for Mini Split Air Conditioners. 3.Pre-flared ends with nuts are for simple and easy installation. Copper aluminum coil line set fits most ductless mini split air conditioners. 4. With embossed polyethyene film, Flame-retarded, 3/8" PE thickness with most of the PVC cover in the market. 5.Comes with insulated line set(10Ft)*1, condensate drain hose(10Ft )*1, pipe insulation straps*1, interconnecting cable(11.5Ft, 16/4)*1, wall filler putty*2, decorative wall cap*1