Brass Construction：Made of brass, these 4.0mm bullet terminals offer excellent conductivity and durability. They can withstand the rigors of automotive and motorcycle electrical systems Package includes:110pcs male bullet terminals,110pcs male insulating sheath,50pcs female terminals,50pcs female terminal sheath,30pcs Double Female Bullet Terminal,30pcs Double Female Terminal Sheathing Insulating Sleeve for Safety：Each bullet terminal comes with an insulation sleeve. This sleeve effectively prevents short circuits and electrical leakage, enhancing the safety of the entire electrical connection Easy using: You just need to connect the male and female terminals at both ends, and then the male and female terminals docked to complete the wiring easily Application: Very suitable for garages, auto electricians, mechanics, workshops, perfect work for car, motorcycle, truck, marine,quad bike,scooter, boats, electric instruments