It is the I-GRIP trekking poles with ANTI-SHOCK feature. Internal springs absorb shock from the ground when you walk, reducing the strain on your shoulders and arms. I-GRIP poles are designed to provide you greater balance and stability in uneven terrains with uphill and downhill, reducing the strain on your knees. They benefit you the most when you hold them in both hands. Set the length so that your elbow makes a 90-degree angle on level ground.