Happy Birthday Kitty Mask Card $ 5.75 Default Title - $ 5.75 Quantity This product is currently sold out. Please fill in the form below if you'd like to be notified when it becomes available. Happy Birthday kitty face mask card for cat lovers! He's saying 'Happy Birthday' with his eyes :D Medium: Card based on my original ink drawing. Size: A2 4.25 x 5.5 in. Quantity: 1 Paper: Smooth white card stock Envelope included.