These are NGK BPR5EFIX-13P spark plugs. I bought them for an Alto Works HA11S, but it seems I mistakenly bought these instead of the BPR5EIX, and they didn't fit. The thread part is the same, but the hex size and height were different. I inserted them into the plug holes once, but they weren't securely fixed, so they haven't been ignited, meaning they are practically new. There is some dirt on the insulator part, but it's from when I tried to install them, so it shouldn't affect their use. I will ship them with the box, although it's a bit beat up.