Fits Caster-40 is a set of 4 casters with stoppers for stable movement. I am selling these because I no longer need them. These have been stored for a long time, so the bag has some dirt on it. I plan to ship via post, and the thickness is exactly 4 cm, so I will pack them as is without wrapping them in bubble wrap. - Model Name: Fits Caster-40 (with stopper) - Included: Set of 4 - Color: Beige Thank you for looking.