Pebble Index 01 Sizing Kit

Last updated March 14, 2026

In order to get the perfect fit you'll need to measure your index finger (or whichever finger you'll use).

Please note that other rings (Oura, wedding rings etc) cannot be used to measure your finger ring size for Index 01. Why? Index 01 has a different shape than any other ring, which means it will fit and feel unlike any other ring. Also, 'standard' ring sizes actually vary. Oura (specifically) and other rings have different inner diameters for each 'size' that do not correspond to Index 01 inner diameters.  

⚠️Important⚠️: You must size your finger using one of these three options to determine your correct size.  If you previously entered your size, please read these instructions to make sure you have picked the correct size. 

1. Buy a sizing kit from us (Recommended) -  Order  a physical sizing kit for $10, including worldwide shipping. This is the easiest option. 2. 3D print a sizing kit -  Download  and 3D print our sizing kit at home. 3. Visit a jeweler - Visit a local jeweler and have them measure the diameter of your index finger, then compare with  our measurement chart  to find the right size.

After you’ve have the sizing kit

Follow the steps below to get an accurate fit. This kit helps you find the right size for the Pebble Index 01. It includes rings in sizes 6 through 15 (14/15 are not in production, if you are interested please  fill out this form ).

Step 1: Test fit with different rings

Most people wear Index 01 on their non-dominant index finger. This allows your thumb to easily press the button while staying out of the way. But you don't have to! You can wear the Index 01 on whichever finger feels right for you.

Start by sliding your finger into different sizes.

  • Do not force the ring onto your finger - that indicates the size is too small
  • You’re looking for a fit that is snug (so the ring doesn’t fall off) but not too tight that you won’t be able to get the ring off.
  • After finding a good size candidate, use scissors or a knife to cut the ring out of the plastic frame.
  • Use a fingernail file or small scissors to smooth down any small
  • Run your finger around the inside and outside to confirm it feels smooth before wearing it.

Step 2: Wear it for a few days

A short test won't give you an accurate read. Wear the ring for at least two to three days and pay attention to how it feels across different situations.

  • Typing on a keyboard
  • Sliding your hand in and out of a pocket
  • Gripping your phone or other objects
  • Folding your hands together

Your fingers bends and folds constantly throughout the day. You want to know how the ring feels during all of it, not just when your hand is still.

Step 3: Check fit at different times of day

Finger size changes throughout the day. Fingers tend to be slimmer in the morning and can swell by the evening, especially in heat or after physical activity.

  • Check how the ring fits when you first wake up.
  • Exercise and body temperature may affect the size of your finger throughout the day
  • Check again in the evening. Both readings matter.

Step 4: Adjust if needed

Try a different size if:

  • The ring digs in or leaves a mark
  • It spins freely or slides off on its own
  • It feels uncomfortable during any of the activities above

Step 5: Submit your size

Once you have found the size that feels right across a full day and a range of activities, that is your size! Visit your  order confirmation page  to submit in your size selection.

Please reach out to us at info@repebble.com if you have any questions.