1. Weight: about 500g/pair2. Size: about 25.5x4.5x1.5 cm/piece3. Material: silicone, iron cylinder, stainless steel buckle4. Applicable people: general5. Applicable scenarios: running, fitness, swimming, dancing, yoga, etc.6. Features: soft silicone material, can be used by adults and children, comfortable to wear, detachable design, easy to use, non-loose metal strap structure, 9-level adjustment, suitable for different groups of people

http://olla.gr/a-pair-outdoor-sports-running-fitness-yoga-load-bracelet-training-plus-heavy-silicone-wristband-purple/