These salt lamp bulbs are for the older cords without transformers. The change over in cords to more waterproof versions are happening Feb-July 2020. We were selling the old cords up to June 30 2020 and they do not have a transformer.
These are 15W / 240 Volts, clear colour (although they look a bit yellow) and with screw base. ignore packaging dimensions below.
Do NOT use these in selenite lamps as it dries them out and they become brittle. Use LED instead.