Eric Hollandsworth exclusively uses Spector Electric Basses.  Please visit Spector Bass and check out some very proper product!

Electric Bass
Spector Legend 5 Classic (Natural Maple)
SpectorCore 4 Fretless (Amber Burst)

Upright Bass
Kremona Upright Bass - Luthier Steve Wilson
fitted with K&K Bass Max 
using K&K Pure Preamp

the Amps
Acoustic Image Coda R
2 X 10" Cabinet (custom build)
15" Cabinet (custom build) 
Ampeg BA 115