Giới thiệu Vòng Silicone 6 Mức Độ Luyện Tập Cơ Tay Và Ngón Tay 6 Mức Độ Sáng Tạo
The grip training device is a very effective finger forearm strength and endurance training device. It has 6 different difficulty levels, and you can use it anytime, anywhere. Try 3 sets of 30-100 times several times a week to get the best results. It can also relieve stress.