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Ring 4 Sizing Kit, Compatible with Ou-ra Ring4, Professional Finger Measuring Tool, Smart Ring Find Your Before You Buy Ring, Size 4 to 15

  • Based on 0 reviews
Condition: New
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$8.99 Why this price?
Save $7.00 was $15.99

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To qualify for a full refund, items must be returned in their original, unused condition. If an item is returned in a used, damaged, or materially different state, you may be granted a partial refund.

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Availability: 20 left in stock
Fulfilled by Amazon

Arrives Thursday, Apr 30
Order within 17 hours and 16 minutes
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Features

  • Find the Right Fit Every Time: Our ring sizing kit compatible with Ou-ra Gen 4 size , makes it easy to measure your finger and find the perfect size before ordering - ensuring comfort and accuracy for you or your loved ones.
  • Easy to Use: Our finger measure for ring size simply follow the number on the card to perform the fitting test. For optimal accuracy and a more comfortable wearing experience, apply a bit of olive oil to make it easier to put on.
  • Wear It Your Way: Smart ring sizing kit suitable for any finger, on either hand. For the best experience, try the index, middle, or ring finger. We recommend wearing the ring sizer for at least 24 hours to confirm your ideal fit.
  • Smart Shopping Starts Here: Use our accurate ring sizing kit to determine the right size in advance and avoid unnecessary returns or exchanges.
  • Non-Standard Sizing: Ring 4 sizes runs a bit different from standard ring sizes, so you can use our sizing kit find your best fit. It comes in whole sizes only - from 4 to 15, with no half sizes.

Package Dimensions: 6.65 x 4.45 x 0.59 inches


Item Weight: 1.44 ounces


Other display features: Wireless


Whats in the box: Ring 4 Sizing Kit


Manufacturer: Starosheit


Date First Available: October 3, 2024


Frequently asked questions

If you place your order now, the estimated arrival date for this product is: Thursday, Apr 30

Yes, absolutely! You may return this product for a full refund within 30 days of receiving it.

To initiate a return, please visit our Returns Center.

View our full returns policy here.

  • Klarna Financing
  • Affirm Pay in 4
  • Affirm Financing
  • Afterpay Financing
  • PayTomorrow Financing
  • Financing through Apple Pay
Leasing options through Acima may also be available during checkout.

Learn more about financing & leasing here.

Top Amazon Reviews


  • Smooth finish and has every size
Perfect match and super easy to use these to select which finger to wear an Oura ring.
Reviewed in the United States on March 15, 2026 by DIYer

  • Worked like intended
Worked great sizing for my Oura ring.
Reviewed in the United States on March 30, 2026 by Erik-Paul Nesbitt

  • Good value
Perfect for letting me find my OURA ring size. It was cheap for all of the sizes I got so it was a good value.
Reviewed in the United States on March 4, 2026 by Karlee

  • RING
GOOD PRODUCT
Reviewed in the United States on March 18, 2026 by Curtis L Cannon Jr

  • Useful
Worked as you would think. Makes ordering your oura ring easy
Reviewed in the United States on March 7, 2026 by Greg R.

  • Worth it
Worked perfectly for sizing my Oura ring.
Reviewed in the United States on February 23, 2026 by Amazon Customer

  • Importante para hacer
Creo que es importante comprar esto antes que el anillo real. Use 2 tamaños diferentes por 2 días en distintos dedos y antes creía que con el tamaño 8 iba a estar bien. Gracias a esto, hoy sé que soy 9 y no 8
Reviewed in the United States on January 23, 2026 by Marcela G-T

  • Follow directions
Easy to use a little costlier than other but if going for ora ring follow directions and it will fit nicely
Reviewed in the United States on January 29, 2026 by Karla Stachurski

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