You will get 180 pieces of compression fittings including 4 different sizes of compression sleeve ferrules, inserts and nuts for your convenience. Sturdy, high-quality, durable brass construction. Lead-free, corrosion-resistant, ductile at high temperatures, low magnetic permeability. These fittings are easy to assemble with no welding, flaring or deburring required. Standard compression fittings are suitable for many applications. This brass compression set can be attached to copper, brass, aluminum or plastic tubing. Flaring tools are not required for assembly. It prevents the plastic tube from collapsing when tightened. and prevent leaks. note: Plastic box styles random, Cannot be chosen the specific styles. size: 1/4inch - 20 Compression Sleeve Ferrules, 20 Compression Inserts and 8 Nuts 3/8inch - 20 Sleeve Ferrules, 20 Inserts and 8 Nuts 5/16inch - 20 Sleeve Ferrules, 20 Inserts and 8 Nuts 1/2inch - 15 ferrules, 15 inserts and 6 nuts. Material: brass colour: gold Package Contents: 30 x Nuts (8 pcs each for 1/4inch, 3/8inch, 5/16inch; 6 pcs for 1/2inch) 75 x Compression sleeve ferrules (20 pcs each for 1/4inch, 3/8inch, 5/16inch; 15 pcs for 1/2inch) 75 x Inserts (20 pcs each for 1/4inch, 3/8inch, 5/16inch; 15 pcs for 1/2inch) Only 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.