Description and Dimension from Amazon and Vanson guitar:

https://www.vansonguitars.com/products/wilkinson-wpb-premium-range-alnico-v-bass-pickups-for-pb-type-guitars-precision-bass

https://www.amazon.co.uk/Wilkinson-Premium-Pickups-Guitars-Precision/dp/B01KXYJS9G

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Wilkinson Premium Range WPB Bass Pickup

These premium range pickups from Wilkinson use Alnico V Polepiece magnets for greater note expression and clarity. They offer a warm, vintage tone that you would expect from a high-end instrument. Other prime features include; Plain Enamel Wire; Fibre Bobbin, & Distinctive Chrome Logo.

Providing classic 'hum-cancelling' tones, with a warm, well rounded sound, the Alnico V Polepiece magnets give you a more effective response while allowing your guitar’s organic sound to ring through. The price-point, as ever, with many of Wilkinson’s vast range of guitar parts should not be taken as indication of the quality!