Small but mighty: The Alien finger trainer from Y&Y Vertical helps you prevent injuries while climbing or bouldering. When used correctly, it balances the different tensions between the flexors and extensors of the fingers with regular training. You can also use the little Alien during your warm-up before climbing or bouldering sessions to optimally warm up your fingers. This pocket-sized training device comes in various strengths, allowing you to choose the right one with the perfect tension for building your finger strength, all conveniently from home or during your lunch break or while commuting.