Master lock no.40, a 4-pin(all standard pins) disc padlock , sometimes I went back to practice standard-pin locks, they seemed more difficult for me nowadays compared to those security-pin locks. : r/lockpicking
Master Lock 1-9/16 In. (40Mm) Wide Laminated Steel Pin Tumbler Padlock With 2 In. (51Mm) Shackle Keyed Alike - - Walmart.com