The listing, Vintage Mah Jong Mahjong tiles Lucky Stretch Bracelet has ended.
Vintage unusual and chunky Mah Jong stretch bracelet. Includes the 5, 6, 7, 8, and 9 tiles and a "green" tile interspersed with green and black beads. It looks like bakelite to me, but I don't have any way of testing. It might just be plastic.