Breathable Soft Silicone Watch Strap 35.3mm for Polar M400 M430 – Black Made of quality silicone material Durable, moderately soft and comfortable to wear The size can be adjusted according to the size of the personal wrist An ideal watch strap replacement for your old, broken one Easy to install and remove Specification: Material: Silicone Length: 145+100mm Width: 35.5mm Watch Dial Diameter: 35.5mm Compatible with: Polar M400 Package included: 1 x Watch Strap Other things not included Size: 115-205mm (Without watch)