Pre-flared ends with nuts are for simple and easy installation. Copper aluminum coil line set fits most ductless mini split air conditioners.Our mini split line is protected with triple-layer insulated cotton, consisting of embossed polyethylene film, weather- foam, and thickened insulating cotton.The ends of the copper pipes are flared perfectly ,and the flare fittings are leak-free. This line set for ac is outfitted with anti-cracking thickened nuts and protective caps.Warm Tip:The black attaching nuts is not inclded in the pakage,you need to buy in other store.Color:WhiteMaterial:plasticPackage Contents:1 x Insulated Coil for Air ConditionerOnly the above package content, other products are not included.Note: Light reflection and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.