Peak Dale tri-fold aperture cards come in packs of 10 with envelopes, made from 300gsm acid-free card with a rectangular aperture for mounting finished cross stitch or embroidery.
A5 packs have a centre rectangular aperture measuring 95mm x 122mm; A6 packs are also sold with envelopes in packs of 10.
Mixed colour packs with round apertures are listed alongside the plain white rectangular options for card finishers.