Acid-free and lignin-Free 300GSM Cards. x10 A6 Ivory and x10 White A6 3 fold square (6x6) aperture cards with envelopes. x10 A6 3 fold square (6x6) aperture cards with envelopes in Ivory. x10 A6 3 fold square (6x6) aperture cards with envelopes in White.