This is made by a third-party manufacturer, not by Polar Original.
Specification:

Brand Name: Meiruo
Material: silicone.
Item Type: Watch Bands
Condition: 100% new and high quality.
Length: 23 cm
Color: Dark Brown, Light Brown and Blue
Clasp type: watch buckle.
Specially designed for Polar M400 / M430 GPS running watch.

Package content:

Bracelet with Remove Tool and Pin

Features:

Simple and direct installation and button removal
The size can be adjusted according to your wrist.
A good replacement for your old and broken strap

Note:

1.Our strap only for Polar M400/ Polar M430
2. Please just contact us if you have any questions.