Compatibility - Altru Print Fuser Kit is compatible with Part #'s; RM1-8508, RM2-3829, CF116-69002, CF116-69003 Supports - Laser Printer M521 / M525 Features - Altru Print high quality components and printer maintenance experts ensure optimum printer performance Warranty - Extended 6-month replacement warranty and product support from our experienced USA based staff; No core return or exchange required; Recycling encouraged Altru Print Fuser Kit Includes - 1 x RM1-8508 Fuser, Prepaid Free Core Return Shipping Label