G305, Orochi V2 if you want a safer egg shape, or the Hati S are all wireless small mice. For wired there's the MM720 for a very comfy mouse shape. Skoll Mini if you want a small ergo in the shape of the Zowie EC series. M1K if you want a pure fingertip mouse. XTRFY M42 or Model O- are another two ambi options.