Safe ring

1. A safe ring comprising:

a primary ring, made from a material having an ultimate tensile strength higher than 60 MPa, the primary ring having one or more weak spots; and

a secondary ring being at least partially encompassed by the primary ring, wherein a circumference of the ring is configured to expand under an application of an external pull force,

wherein the primary ring is one of: extending over edges of the secondary ring and mechanically connected to the secondary ring.

2. The ring of claim 1 , wherein the secondary ring is made from a tearable material, selected such that the secondary ring is configured to be torn under an external pull force of at least 20 Newton.

3. The ring of claim 2 , wherein the tearable material comprises at least one of: a polymer, a natural fabric, a synthetic fabric, wood, and silicone.

4. The ring of claim 2 , wherein the tearable material is at least one of: a non-allergenic material, a heat insulating material, and an electricity insulating material.

5. The ring of claim 1 , wherein the secondary ring comprises one or more weak spots that are configured to be torn under the external pull force.

6. The ring of claim 1 , wherein the secondary ring is made from an extendable material, selected such that the secondary ring is configured to extend under an external pull force of at least 10 Newton.

7. The ring of claim 6 , wherein the extendable material comprises at least one of: elastomers, a natural fabric, a synthetic fabric and silicone.

8. The ring of claim 6 , wherein the extendable material is a at least one of: a non-allergenic material, a heat insulating material, and an electricity insulating material.

9. The ring of claim 1 , wherein the secondary ring is configured to encompass at least a portion of a circumference of a finger.

10. The ring of claim 1 , wherein the secondary ring is one of: extending over edges of the primary ring and fully coating the primary ring.

11. The ring of claim 1 , wherein the one or more weak spots include at least two ends of the primary ring and the ring includes at least one component configured to limit relative movement of the at least two ends with respect to each other.

12. The ring of claim 11 , wherein the at least one component is one or more connectors configured to limit the relative movement of the at least two ends with respect to each other.

13. The ring of claim 12 , wherein the one or more connectors are configured to limit relative movement of the at least two ends in at least two perpendicular axes.

14. The ring of claim 13 , wherein the one or more connectors are configured to limit relative movement of the at least two ends in three perpendicular axes.

15. The ring of claim 11 , wherein the at least one component is the secondary ring made from a material having at least Shore-A 60 hardness.

16. The ring of claim 1 , wherein the one or more weak spots have a cross section smaller in at least one dimension, than cross sections in other portions of the primary ring.

17. The ring of claim 1 , wherein the primary ring comprises at least two portions made from at least two different materials and wherein a connection area between each two portions creates a weak spot.

18. The ring of claim 1 , wherein the one or more weak spots comprises one or more of: slots, cuts, grooves, cavities, conduits, gaps, connections, connection areas, openings and any combination thereof.

19. The ring of claim 1 , wherein the primary ring material comprises at least one of, a metal, metal alloy, wood, ceramics, glass, resin, carbon fiber, stone, marble, and composite material.

20. The ring of claim 1 , wherein the primary ring has a cross section of 0.5-100 mm 2 .

21. The ring of claim 1 , wherein the secondary ring is a full ring.

22. The ring of claim 1 , wherein the primary ring comprises at least two portions.