Standard arms are 25 inches long. ProArms telescope from 23 inches to 37 inches, so they can get your camera/gimbal 2 inches closer and 12 inches farther away from the operator.
Ready Rig GS https://www.ready-rig.com/collections/complete-setups/products/ready-rig-gs
Ready Rig GS + ProArms https://www.ready-rig.com/collections/complete-setups/products/ready-rig-gs-proarms
Ready Rig GS VEGA https://www.ready-rig.com/collections/complete-setups/products/ready-rig-vega