Slope 30 1 x 1 x 2/3 with Swiss Cheese Pattern : Part 54200pb103 | BrickLink
LEGO® 54200 6040126 - ToyPro
Amazon.com: Classic Bricks 30 Slope 1x1x2/3 (Cheese Slope) 100 Piece, Compatible with Lego Parts and Pieces 50746, Creative Play Set - 100% Compatible with All Major Brick Brands(Colour:Light Gray) : Toys & Games