The Ping Sigma 2 Arna is a mid-mallet putter featuring an adjustable-length shaft and a dual-durometer face insert.Key FeaturesAdjustable Length: The lightweight shaft adjusts from 32 to 36 inches using a special tool inserted into the grip.Dual-Durometer Face: A soft front layer aids precision on short putts, while a firmer back layer gives feedback and distance control on long putts.True-Roll (TR) Technology: A variable-depth face milling pattern helps maintain consistent ball speed on off-center hits.Head Weight: 360 grams with a mid-hang balance suited for a slight-arc stroke.