Slope, Curved 2 x 1 x 2/3 : Part 11477 | BrickLink
Amazon.com: Classic Building Slope Curved 2x1x2/3, 100 Piece Bright Light Blue Slope Curved Bulk, Compatible with Lego Parts and Pieces 11477(Colour: Bright Light Blue) : Toys & Games
LEGO PART 11477 Slope Curved 2 x 1 No Studs [1/2 Bow] | Rebrickable - Build with LEGO