This is a genuine black drum for HL-5240. Its capacity is about 25000 prints based on 5% coverage of A4 page format.

Brother DR-3100. Type: Original, Compatibility: HL-5250DNHY, HL-5240L, DCP-8060, HL-5250DN, HL-5270DN, HL-5270DN2LT, DCP-8065DN, HL-5280DW,..., Page yield: 25000 pages. Width: 8.98" (228 mm), Depth: 5.91" (150 mm), Height: 14" (355 mm). Package weight: 2.4 lbs (1.09 kg). Package dimensions (WxDxH): 9.06 x 14.2 x 5.91" (230 x 360 x 150 mm). Pallet height: 6.46" (16.4 cm), Pallet weight: 227.1 lbs (103 kg), Number of cartons per pallet: 27 pc(s)

Type	Original
Compatibility	HL-5250DNHY, HL-5240L, DCP-8060, HL-5250DN, HL-5270DN, HL-5270DN2LT, DCP-8065DN, HL-5280DW, MFC-8460N, MFC-8860DN, MFC-8870DW
Page yield	25000 pages
Print technology	Laser printing
Product color	Gray
Country of origin	China
Width	8.98" (228 mm)
Depth	5.91" (150 mm)
Height	14" (355 mm)
Weight	12.6 oz (357 g)
Package weight	2.4 lbs (1.09 kg)
Package dimensions (WxDxH)	9.06 x 14.2 x 5.91" (230 x 360 x 150 mm)
Pallet type	800 x 1200 mm
Harmonized System (HS) code	84439990
Pallet height	6.46" (16.4 cm)
Pallet weight	227.1 lbs (103 kg)
Number of cartons per pallet	27 pc(s)
Number of cartons per pallet layer	3 pc(s)
Number of layers per pallet	9 pc(s)
Quantity per pallet	81 pc(s)