Mizuno Runbird
The Mizuno Runbird is a two-piece, single cover golf ball with 566 dimples, made by Mizuno Corporation in Japan. Its manufacturer declares low with driver, low with short iron spin. It appears on the R&A and USGA List of Conforming Golf Balls effective 2 September 2026 to 6 October 2026, under identifier RC2025-0961.
What the official list says
- Pole markingsWhat is printed on the two poles of the ball: usually brand and model.
- Mizuno Runbird logo in blue
- Seam markingsWhat is printed on the equator: alignment line, number, minor text.
- RB566 in split arrow in blue
- Cover colour
- white
- Construction
- two-piece, single cover2P-1c
- Covers
- single cover
- Driver spin
- low
- Short-iron spin
- low
- Spin profile
- low with driver, low with short ironL-L
- Dimples
- 566
- Manufacturer
- Mizuno Corporation
- Country
- Japan
- Identifier
- RC2025-0961
Data from the List of Conforming Golf Balls (USGA and R&A), edition effective 2 September 2026 to 6 October 2026. The list itself is the only valid source for a ruling. See the official list at The R&A ↗
Frequently asked
Is the Mizuno Runbird conforming for competition play?
Yes: it is on the R&A and USGA List of Conforming Golf Balls effective until 6 October 2026. For a ruling, always check the current edition of the official list.
How many pieces does the Mizuno Runbird have?
According to the manufacturer it is a two-piece, single cover ball (code 2P-1c on the official list).
How many dimples does the Mizuno Runbird have?
566 dimples, as declared by Mizuno Corporation on the official list.
What is printed on the Mizuno Runbird?
On the poles: Mizuno Runbird logo in blue. On the equator: RB566 in split arrow in blue. Markings identify the ball on the conforming list; the play number does not count as a marking.