All genuine Brother® printer supplies are designed as part of an entire printing system and our supplies are designed with Brother® products in mind, to provide superior degree of quality.Genuine Brother® toner is delicately balanced to provide even flow and toner distribution.All genuine Brother® printer supplies are designed as part of an entire printing system and our supplies are designed with Brother® products in mind, to provide superior degree of quality. Genuine Brother® toner is delicately balanced to provide even flow and toner distribution.