Below is an context that describes a sql query, paired with an question that provides further information. Write an answer that appropriately completes the request.  # noqa: E501
### Context:
CREATE TABLE table_1251878_1 (width VARCHAR, frame_size VARCHAR)
### Question:
what's the width with frame size being 4.5k
### Answer:
SELECT width FROM table_1251878_1 WHERE frame_size = "4.5K"