A tamper evident closure (TEC) includes a closure cap and at least one tamper evident ring forming a recessed space therein. The ring has a body attached by at least one frangible bridge member to the cap. The ring includes at least one protrusion member spaced there around such that the protrusion members are formed by being stamped to protrude into the recessed space. There is also a related protrusion member forming apparatus. The apparatus includes a base end and a forming end. The forming end includes shaped protuberances which during use cause a stamping or deforming action with respect to a holding action on an inner ring member and outer ring member of a tamper evident ring of a tamper evident closure, to form the protrusion members in the inner ring member. There is also a method of manufacture of a tamper evident closure (TEC).