RUBY ROCK-IT-Bella: RSVP Cards. The shimmery paper of these cards and envelopes will add an extra special touch to your RSVP cards; invitations; or thank-you notes. This package includes ten 3-3/8x5-1/8 inch blank single-panel note cards and ten 3-1/2x5-3/4 inch matching envelopes. Sample wording for RSVP cards is included. Acid Free.