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Description
Bestorq 340-XL-663 Trapezoidal Timing BeltsTrapezoidal Timing Belts XL Timing Belt Part Number (Length Profile Width) 340 XL 663 Pitch (in.) . 200 hs (in.) . 090 ht (in.) . 050 Teeth 170 Pitch Length (in.) 34. 00 Width (in.) 6. 63 Weight (lbs) 0. 812
| Trapezoidal Timing Belts | XL Timing Belt |
|---|---|
| Part Number (Length-Profile-Width) | 340-XL-663 |
| Pitch (in.) | .200 |
| hs (in.) | .090 |
| ht (in.) | .050 |
| Teeth | 170 |
| Pitch Length (in.) | 34.00 |
| Width (in.) | 6.63 |
| Weight (lbs) | 0.812 |
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4.7 ★★★★★
Based on 382 reviews
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Product Reviews
★★★★★ 5
Serta Pillows
Style: Side Sleeper, Pattern Name: King
They’re very comfortable.
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Reviewed in the United States on October 25, 2025
★★★★★ 3
Great quality but big
Style: Side Sleeper, Pattern Name: King
These pillows seem to be very good quality. I couldn’t wait to try them. I soon realized that they’re very thick & too high for my neck. I can push the pillow down but it doesn’t stay so I’d say they’re too firm for me & don’t support the neck properly because of the height.
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Reviewed in the United States on February 16, 2025
★★★★★ 5
my fav now after using 50+ pillows
Style: Back Sleeper, Pattern Name: King
I have always struggled to find the perfect pillow, and so far I have had 50+ pillows. Personally, I like my pillow to be on thinner side as I look for more support for my neck.
This is my first time buying pillows online, because I like to physically touch and feel the firmness and thickness before I purchase my pillows. I am so glad I did it! These pillows are just PERFECT for me! Perfect firmness, perfect thickness and perfect material.
One thing I suggest is that be extra cautious when you open the package. These pillows were rolled and put in a relatively thin shipping bag, so when you open with sharp objects be careful not to cut your new favorite pillows!
I let the pillows sit for about 48 hours before I started using them, but I assume you don't have to wait that long.
Overall, I am very happy with my first online pillow purchase with Serta!
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Reviewed in the United States on April 1, 2020
★★★★★ 2
Not worth it
Style: Side Sleeper, Pattern Name: King
Feel nice and fluffy for couple months, then go flat
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Reviewed in the United States on September 5, 2025
★★★★★ 1
14% polyester filling
Style: Side Sleeper, Pattern Name: Jumbo
It has 14% polyester filling. The description is not complete in amazon.
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Reviewed in the United States on January 5, 2026