These are BCW Deck Guards Double Matte Blue Sleeves 50 Count made by the good people over at BCW Supplies.

This Deck Guard comes with 50 Card Sleeves. These sleeves are great for protecting your valuable cards while still retaining the ability to play them. 

Sleeves are sized 66 x 91 mm for standard cards and are acid-free.

Recommended Age: 4

Condition: Brand New and Sealed

Dimensions: 66mm x 91mm X 1 BCW Deck Guards Double Matte Blue Sleeves 50 Count