The protective sleeve features fine workmanship, which can be used for a long time.The protective sleeve can keep your stopwatch from impact, water and dust.Made of silicone, the protective sleeve is eco-friendly and durable to use.The length of the protective sleeve is 85.3mm, width is 52.4mm and height is 16.7mm.The protective sleeve is compatible with Bryton-Rider 430 and compatible with Bryton-Rider 320.Item Name: Protective SleeveMaterial: SiliconeApplicable Model: Compatible with Bryton-Rider 430, Compatible with Bryton-Rider 320Features: Shock-proof, Wear-resistant, LightweightSize Details: 8.53cm x 5.24cm x 1.67cm/3.36" x 2.06" x 0.66" (Approx.)Notes:Due to the light and the screen setting difference, the item's color may slightly differs from the pictures.Please allow slight dimension difference due to the manual measurement.Package Includes:1 x Protective Sleeve(Others Not Included)