All stainless steel is durable and will not be damaged Hand pattern polishing anti-sweat and anti-slip Hand Exercisers: Unlike most workouts, you can take these hand trainer with you and exercise everywhere you go. Use them at home, at the office or when traveling, and turn your downtime into a productive workout session. Increases Hand Grip Strengthener: Targeting your forearms and arm strengthener, fingers, and wrists, these hand grips provide the perfect way for building up hand strength and increasing your grip. Easy to Carry:They are small equipment so you can use them anywhere and anytime, super easy to carry and use.