There are many companies that sell the marked poker cards and so on. Every company and every technician has their own way to mark paying cards. Here I mean the mode of marks but not the technology.
The big marks with very special sign for suit on the middle is the most popular marks of our GS marked cards. These special big marks are very popular among our customers for the marks is always big and clear to see. And the signs is easy to recognize for the suits. Usually if nothing special, we would mark playing cards with the special big marks for our customers, especially for those who have not so good eyesight. As that shows in the picture, the marks have the number in the middle and two signs for suits in the opposite corners.