As many mice as you want, as reflected in your customized pledge amount. Must include at least one Lively Mouse. Adjust your pledge amount to cover the mice you want (see the cost charts in the blurb). Eg, $356 would cover one Lively Mouse, plus one Tiny Mouse. $600 would cover one Lively and two Sprightlys, Etc. Are you outside the continental USA? If so, don't forget to add $20 extra for shipping for each additional mouse beyond the 2 mice covered here.