These are the Old Bones Tibula P bass pickups, they are wound hotter than standard P-bass pickups to bring out more of the lows and mdis. If you're looking to push your amp harder, but still get warmth and clarity these may well be what you're looking for. As with the classic P bass pickups they are RWRP (reverse wound, reverse polarity) on each coil, so they have a humbucking effect. 
 
They are made with plain enamelle wire, AlNiCo 5 magnets, and over wound before being wax potted. These can be paired with the bridge pickup from the Fibula J bass set to make a Tib & Fib set for your PJ set up basses.
 
The DCR readings for these are 14.0Kohms
 
VAT for UK customers added at checkout