mud season $20.00 Inside Message blank 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". mud season quantity Add to cart Categories: Cycling, Skiing, Sports. Related Products Room With a View $20.00 Never Look Back $20.00 Father, sun and holy bicycle $20.00 Baby with bike trailer $20.00