The K1 from Aspire features a 1.5ml tank for storing your e-liquid, and uses Aspire's BVC atomisers. It comes pre-installed with a 1.8 Ohm resistance atomiser.
Please note that as this is a clearomizer originally designed for eGo style batteries, the connection at the bottom is hollow and cannot be used with box mods, such as the iStick 20W, without a 510 adaptor. Some box mods (for example the iStick 20W and iStick Mini) come with these adaptors included, but the majority of box mods do not. Please check to see if you need the adaptor before purchasing.