Supla 150 Pcs A7 Invitation Envelopes in White Peel & Seal Self Seal 5 1/4 x 7 1/4 Envelopes 95lbs. The A7 envelopes also fit inside envelope sizes of A8, A9, A10. - Material: The A7 Invitation Envelopes are made of 95lb quality paper and will not easy to tear.
eBay