24 Bounce House Fill-in Kids Birthday Party Invitations Paper Weight: 100 lb. Premium Quality Heavy Weight Uncoated Card Stock. Paper Finish: Uncoated Smooth for easy to write. Card size: 4.25 x 5.5 (in inch) flat with full color double-sided digital printing. Card thickness: 100 lb. premium quality uncoated smooth card stock for easy to write. Sold in pack of 24 fill-in invitations and 24 white envelopes. Fixed price shipping for any quantity.