1. Comes with a transparent box with compartments for easy store and carry. 2. Quick splice, an easy one step connection of wires, preventing corrosion and insulated. Easy to use. 3. Widely used in the wire connection for household and industrial purposes. Ideal used in marine and automobile applications. 4. Material: PP + copper 5. Package: Red wire crimp: 22-18AWG 0.5-1.0 square millimeter (20 PCS) Blue wire crimp: 17-14AWG 0.75-2.5 square millimeter (15 PCS) Yellow wire crimp: 12-10AWG 4-6 square millimeter (15 PCS) Blue main wire crimp: 18-14AWG 0.75-2.5 square millimeter (40 PCS)