This is a pack of four female ProTek R/C 5.0mm "Super Bullet" Solid Gold Connectors. The ProTek R/C "Super Bullet" Solid Gold Connectors are an absolute must for high current / high voltage applications! With lower resistance than a typical T-style plug and traditional spring-type bullet connectors, they are the new standard for brushless applications. They can be used for battery connectors that require a 5mm bullet, as well as motor to speed control connectors.
ProTek R/C is an A Main Hobbies brand.