0.28 GRAM

It's important to note that not all airsoft guns are designed to use heavier weight BBs like .28g, so it's best to consult with the manufacturer or check the specifications of your airsoft gun before using them. Additionally, the type of BB you choose can also affect the FPS (feet per second) of your airsoft gun, so keep that in mind when selecting your BBs. In general, the heavier the BB, the lower the FPS, and vice versa. It's always recommended to do some experimentation and find the weight that works best for your airsoft gun and playstyle.