Basically a vintage looking Hue bulb with a fake exposed filament, there are cheaper generic brand ones available but if you've bought in to the Hue environment, they generally sit at the $40 mark … They are around the 550 lumen mark so not overly bright and should be considered for areas where you want an exposed light, i.e not behind a lampshade or cover … maybe the bedroom ?
In any case happy hunting …
Lifted from the Amazon description:
Introducing our new Philips hue Bluetooth range - it’s now easier than ever to get started with smart home lighting With no complex installation required, simply screw in your new bulbs and start controlling your smart LED lights straight out of the box using the ‘Philips Hue Bluetooth’ app. Or try controlling your lights with your voice using Alexa or Google Assistant for hands-free voice control. With our Philips hue ‘White’ range, experience comfortable, soft White light in your room with fully dimmable smart lighting control. Are you an existing Philips hue customer? Don’t worry, our new Bluetooth range is still fully compatible with the Bridge and all other accessories Discover Philips hue - the latest in smart home lighting.
Side note
A hue bridge is not required for these bulbs but there isn't any real advantage to them if you are only using Bluetooth for them.