Count down to the holidays with this festive BLDR Hello Kitty and Friends advent calendar. Each day, open a new door to reveal a holiday-themed item or one of 16 charming mini builds, plus eight adorable 1.5-inch characters dressed in exclusive seasonal outfits—including Hello Kitty, Keroppi, Badtz-maru, Pochacco, My Melody, Chococat, Tuxedosam, and Cinnamoroll. The 310-piece set is fully compatible with other major construction brick brands, so you can expand your Hello Kitty world with ease.