Multi-layer golf balls having a hard, high compression center, a relatively soft intermediate layer, and a stiff outer cover layer, are provided. A bit node computation block receives the bits and associated beliefs, and generates a plurality of bit node messages. The flap-like tear open part is provided with a reinforcement having at least one flexible layer. Each cradle comprises a pair of seat flanges upon which the magnets seat. The optical diaphragm is at least partly stowable in a space defined by the concave surface. The metal film or islands are configured such that the incident radiation is resonant with at least one plasmon mode on the metal film or metal islands.