Don't let walmart fool you?
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$15.37 Levolor-Kirsch 50 feet, white Free store pickup. Free shipping on orders over $50
Product in Inches (L x W x H): 7.25 x 5.25 x 1.5 Of course this it the bag, not the item. I hate that. So they don't give the diameter, but it's probably standard curtain rod cord diameter.
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Better yet
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Levelor 50 Ft Traverse Rod Cord Kit (1910053) Doesn't mention Kirsch. Maybe they had a fight. $8.49 Also free store pickup Save 45% from what Walmart charges.
They've gotten a reputation for being cheap, and they hope you'll rely on that, even when they're more expensive.
FWIW
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Same thing Levolor-kirsch 14254 white $9.17 + $5.90 shipping $15.07 Save 30 cents compared to Walmart. Lose 6.50 compared to Ace.
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$24 includes shipping. 50 feet, white, brown, or gold. kit includes cord, lacing hook, cord guide and instructions