Haiwan tea factory is an excellent choice for blended ripe pu-erh as the ex-manager of the Manager of the Menghai tea factory is the founder and general director of the Haiwan tea factory. As a result the "wu dui" fermentation process used in the production of Haiwan Ripe Pu-erhs is very close to that of the Menghai tea factory. This cake is the same blend as Menghai's 7572 ripe cake.