This listing is for 5 PACKS OF 10 NEEDLES ( 50 TOTAL) 16X257 size #16 for the BROTHER 500 & 600 Series Serger Sewing Machine.

The Brand of these Needles is  "ORGAN"

The system of this needle is:  16x257

These Needles fit Brother Serger Model Numbers: 523, 523N, 524, 524N, 525, 525N, 526, 526N, 526LCW, 530, 530D, 546, 546D, 626, 634D, 834DP

The SIZE of the Needles in this listing is:   16   (Metric Size 100)

"BP" IS FOR BALL POINT.