Features:

The sound of P90 pickup is more neutral tone,less humming.
P90 pickups also use a single magnet, like single-coil pickups. The main difference is that they have a wider, but shorter bobbin (the casing around the pickup). 
Due to this wider bobbin, P90 pickups have a higher output than standard single coil pickups, but not as high as humbuckers. This is why the sound of P90s is commonly referred to as a cross between single coils and humbuckers. 
The tone has more depth and volume than single coils and are less twangy, but not as warm and loud as with humbuckers. P90s tend to suffer less with humming than single coils do, although they still don't cope as well with high gain as humbuckers. 
P90 pickups are very versatile. They are more closely related to single coil pickups though, so work great for country and blues. However, due to the higher output, they can cope a bit better with rock music, although they are not commonly used for anything very heavy like metal. 
P90 pickups are less common than single coils and humbuckers, so fewer guitars tend to come equipped with them. They tend to be found on variations of classic guitars like Les Pauls, SGs, Strats and Teles .

Specifications:

Position: Neck/Bridge
Fit: LP guitar
Cable:4 conductor
Pole Piece: 6 adjustable screws
Pickup Pole Spacing: 50mm/52mm
Resistance: N:6.9K B:7.2K
Cover: Metal
Base: Copper
Magnet: Ceramic Magnets
Color: Black
Item size: Pickup: 11.8*4*1.7cm
Item weight: 176.8g
SKU: EGP-145S

Package List:
2*P90 Guitar Pickup
4*Springs
4*Screws