This is a Rico SLA07 budget fabric tenor/baritone saxophone strap.
Jazz Stripe design, curved open hook.
More details from https://www.daddario.com/products/woodwinds/woodwinds-accessories/straps/tenor-baritone-sax-straps/item/rico-saxophone-strap-tenorbaritone-jazz-stripe-6012/
Any questions, just ask.