The PQ-1200-00 is TUSQ 4 string slotted bass nut.  It is a great option to upgrade or replace the nut on your bass.

• Length: 1 5/8" (41.02mm)
• Width: 3/16" (4.62mm)
• Height: 11/32" (8.84mm)
• E to E: 1 7/32" (31.09mm)