Magic Trick Toy - Ring and Spring

Magic Trick Toy - Ring and Spring
1) Magician can take out a ring which is locked on a spring.
2) Performer shows a small solid metal ring and a piece of spring,both items can be examinated by spectator
3) After the examination,performer makes the metal ring penetrates through the spring and hanging in the spring
4) Spectator is invited to remove the ring from the spring but it just doesn't come off,however,performer can remove it effortlessly