security labelAll Samsung supplies carry a colour changing security label to prove they are original products. 1. When the label is tilted. the colour changes from clear to cyan. 2. The embossed characters change colour between red gold and blue when viewed from different angles. 3. Verification of the embossed character is possible by feeling the texture.genuine qualityOriginal supplies enable consistent printing without reliability problems. Samsung original supplies guarantee high quality pages without quality defects.standardise cartridgeSamsung implements ISO standard. It is a trusted test method for determining the page yield of toner cartridges for mono laser printers. Samsung has tested all current laserjet cartridges in accordance with the ISO / IEC 19752 standard. giving customers more confidence and reliability when basing purchase decisions on toner yields.easy toner changeSamsung printer cartridges are easy to change by following 3 steps. 1. Open the front cabinet. 2. Change cartridges. 3. Close cabinet.Compatible Printers: Samsung ML-4050 NG. Samsung ML-4050. Samsung ML-4000 Series. Samsung ML-4551 NG. Samsung ML-4552 N. Samsung ML-4050 Series. Samsung ML-4051 N. Samsung ML-4551 NRT. Samsung ML-4551 NDR. Samsung ML-4551 NJ. Samsung ML-4551 Series. Samsung ML-4555 N. Samsung ML-4551 NR. Samsung ML-4551. Samsung ML-4550. Samsung ML-4055 N. Samsung ML-4050 N. Samsung ML-4551 ND. Samsung ML-4551 N. Samsung ML-4050 ND