This is a set of 36 salt licks for racing pigeons. Please refer to the separate description for details. P.S. The salt licks are made by mixing the 7 types shown in the third photo and coating them with a mixture of the 3 types shown in the fourth photo, stirred with water. Smoked rice husks are no longer used; the amount of charcoal has been increased to improve hardness. Thank you for looking.