Friendship is Continuous $20.00 Inside Message Blank Inside Packages of Heartstrings® cards are shrink-wrapped and sold in sets of 10 cards with envelopes. The actual card size is 4 1/4" x 5 1/2". Friendship is Continuous quantity Add to cart SKU: 47. Category: Friendship & Support. Tags: art cards, art greeting cards, friendship cards, friendship greeting cards, support cards, support greeting cards, supportive cards, supportive greeting cards, unique cards, unique greeting cards. Related Products High Hopes $20.00 A Simple Thank You $20.00 The Past is Gone $20.00 Haven’t Seen You in Many Moons $20.00