You’re Invited! Invite all your friends to your Halloween party with these creepy Boneyard Party Invitations. Combine with our range of Boneyard party supplies for a terrifyingly good Halloween celebration. Item Includes: 20 x Invitations. 20 x Envelopes. 20 x Sticker Seals. 20 x Save the date stickers. Fit and Sizing: Invitations measure 10cm x 15cm / 4in x 6in.