SRSport

Just bought some 4pots of ebay described as "no pistons seized". but before I get them fitted are you able to check if this is the case? Should you be able see movement with fingers, screwdriver etc? I've had a go& all seem solid but don't know if this is normal as they would normally receive much greater forces when on the car.

Can someone tell me if there is a way to check them before paying for fitting, realising they're seized, paying to take them off fixing them and then putting them back on?