Parents of twins - best gifts?

[devsdev]

Hi all,

My friends are currently in labour with their twin boys in the US (so exciting!). I'm going to send a host of baby toys we have saved up from our kids and they also have quite a few things from family there. However I obviously want to get them something "new" and special but also useful. What is the best thing you had for twin kids/boys (aside from someone to help out/cook/clean etc which I wish I could offer!)?

Thanks!