1.Please check the joint parts of grip strengthener and make sure it is steady with no loose parts.2.Please choose the product which is suitable for your physical ability to avoid muscle sprain. 3.Please exercise in a wide space to avoid hurting other people. 4.Children under 12 years old are not supposed to use this product. 5. To prolong the service life, keep it in a cool and dry place and clean it after use.
