This is a Neotech Classic saxophone strap, swivel hook, red/black colour. Note that the hook is more rounded than in the link's picture.
Neotech Classic Saxophone Strap with Swivel Hook Regular in Black
Neotech 2001152 Saxophone Strap Classic, Black, Junior
Neotech 1901192 Saxophone Strap Soft Sax Black, length 43,2-53,3cm Metal snap hooks
Neotech 1901152 Saxophone Strap in Black - Junior Version
Neotech 3901162 Saxophone Strap Pad-It, black, Regular
Neotech 1901172 Saxophone Strap Soft Black XL, length 48,3-66cm
