This Valentineâ€™s Day Grease Card reads on the front 'Happy Galentine's Day.â€™ It includes Sandy and friends. Inside the card there is plenty of room for you to write your own message. â€¢ Dimensions: 7 X 6 inches and 190 X 165 mm envelope. â€¢ With foil pg 1 full colour inside. Grease was launched back in 1978 and is still just as popular now, as it was then. This incredible movie is an American musical romantic comedy starringÂ John Travolta and Olivia Newton-John as Danny and Sandy.