VEVOR Mini Split Line Set We use high-quality copper tubes thatcomply with ASTM standards, offering excellent toughness andhardness. The three-layer insulation cotton provides effectiveinsulation, specifically designed for mini-split air conditioningsystems. Utilizing pure copper pipes, our productsoffer flexibility, allowing bending and straightening withoutbreaking. They resist pulling and bending, with sufficient lengthto connect indoor and outdoor units. Even when encountering cornersthat require bending, piping is easily managed. The refrigeration copper tube containshigh-pressure and low-pressure tubes, designed specifically formini-split air conditioning systems used in homes, offices, malls,restaurants, and similar spaces. We strictly control the materials used,rejecting inferior ones. We use high-hardness thickened brass nuts,fluoroelastomer-coated smooth flare mouths, and protective coversto prevent dust from entering the copper tubes. To better protect the internal coppertubes, unlike ordinary double-layer insulation materials, VEVORemploys three-layer insulation materials for superior insulationperformance. The embossed surface treatment enhances durability,showcasing undeniable strength.