This Lot is 50pcs of New TOCOS (Tokyo Cosmos Electric Co. LTD) 50 K Surface Mount POT in 4mm Square Package (detail size 5.0x4.5x2.5mm). Part Number: G4ATB503M. 

• Resistance: 50 K
• Power Handling: 0.25W
• Number of Turns: Single
• Adjustment Type: Top
• Resistive Material: Sealed Cermet
• Terminal Type: J leads
• Operating Temp: -55C to +125C
• Package Size: 5.0x4.5x2.5mm

Data sheet:

http://www.rfbayinc.com/upload/files/data_sheet/tocog43a.pdf