Answered: Pneumatics pistons

Hi i just purchased my pnumatics 2 weeks ago from Vex Canada and it seems as if the pnumatics that i revievd act like single acting instead of double acting which i ordered. I payed for the double acting pnumatics but it is working like single with string. Is it a wrong delivery or is there way to make pnumatic pistons retract with air? Bexause the pistons shoots out really fast and come back super slow like a string.???

Hi i understood the problem as a team helped me out!