Package contents - Includes 2 parts of the treadmill magnetic key. The two-piece set provides enough quantity for daily use and replacement needs. - Not suitable for children over 13 years. Material and durability - Made of premium plastic and magnet for reliability and durability. - Easy to use and resistant to breakage, designed for long service life. Size and fit - Total length: 98 cm - Round magnetic clasp length: 3.3 cm - Clip length: 4.4 cm - Please check these dimensions before purchasing. Compatibility and usage - Suitable for most treadmills that require a circular safety key. - The key can be folded and clipped onto clothing for convenient use. Use scenarios - Spare key for a home gym: keep a backup key on hand so a replacement is ready if needed. - Multi-user or gym setting: provide spare keys at different machines to minimize downtime from lost keys. - Travel or shared environments: attach to clothing or a bag for easy access when using different machines or locations. Notes - This product is designed for treadmills that use a circular safety key and includes a two-piece set for convenience and replacement needs.