reactive or functioning or allowing movement in two usually opposite directions

reactive or functioning or allowing movement in two usually opposite directions

reactive or functioning or allowing movement in two usually opposite directions

reactive or functioning or allowing movement in two usually opposite directions

reactive or functioning or allowing movement in two usually opposite directions

reactive or functioning or allowing movement in two usually opposite directions

reactive or functioning or allowing movement in two usually opposite directions

reactive or functioning or allowing movement in two usually opposite directions

reactive or functioning or allowing movement in two usually opposite directions

reactive or functioning or allowing movement in two usually opposite directions