Geekvape U Replacement Cartridge has 2ml capacity. 

3pcs/pack 2ml

Designed for:
Geekvape Sonder U Pod System Kit 1000mAh
Geekvape AU(Aegis U) Pod Kit 800mAh
Geekvape Obelisk U Pod Kit 950mAh
Geekvape Wenax U Pod Kit 1000mAh
Digiflavor U Pod Kit 1000mAh

Parameters:
Capacity: 2ml
Resistance:
0.7Ω, 16-19W
1.1Ω, 9-12W

Packages:
1x Geekvape U Cartridge Pod pack