This is a sleeve guard for the sleeve for standard size cards (68 x 93 mm) that boasts the strongest hardness. 
You can insert the sleeve with the card as it is to protect it. 
Uses high quality domestic timber. 
The new method makes it difficult for the adhesive to break, and achieves high transparency with a thick and hard material. 
With the "hardest" strength, it protects the important card and sleeve entirely from friction. 

Standard Size (Inside dimension: 68 x 93mm / Clear type / 50 pieces per pack)

* Since August 2016, the package size is indicated as "inner size".