Pet Secrets Custom Invitations are printed on eco-friendly recyclable heavy-weight paper. It is easy to personalize your custom invitations to impress your guests. Follow our template or personalize with your message. Each line represents a corresponding line on the invitation. Birthday Direct's exclusive Pet Secrets Custom Invitations are printed on sustainable forestry-certified, recycled content paper and are sold in sets of 4. Envelopes are included with each invite order.