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General Mills has produced an extremely limited number of boxes of marshmallow-only boxes of Lucky Charms, but the variation of the popular cereal won’t be available on store shelves.

The company announced on Wednesday that there will be 10 boxes available.

“The Lucky Charms team receives countless calls, emails, tweets and Facebook posts from marshmallow-obsessed fans longing for a box filled with only the magically-delicious marshmallows,” General Mills posted on its official blog.

So how can you get your hands on one of the 10 boxes? Share a “Lucky Charms Lucky Selfie.”

“It’s simple! Just share a photo of yourself holding an imaginary box of Lucky Charms on Facebook, Twitter or Instagram between October 14 and 18 using #Lucky10Sweepstakes,” the company said.

The sweepstakes ends on October 18.