It's hard being a teeny spider. There ain't much to eat that's littler than you, and lots of bigger things that would like to turn you into a snack. It also takes forever to spin a web that's big enough to matter, and don't even mention traveling.
These little spiders decided to work together to achieve something greater, and are all clinging tightly together in the shape of a wand. Perhaps this way they can spin a really good web, and someone will carry them in their coat where they can eat pocket sand and be safe, and even see the world!
They are only teeny spiders, though, so they will probably get bored after shooting their webs about seven times. And it's hard having 9,999 roommates. The bickering! Yeah, it's not gonna last. But it could be fun in the meantime. Just don't squish 'em!
When the last charge is expended, this wand dissolves into 10,000 teeny spiders.