This is a 4 pack of 50" or 42" Replacement belts for your Laguna/Pacifica GT400/ GT800 Potter's Wheel

Very old Pacifica wheels tend to use these 50" belts. The best thing to do is to measure your existing belts:

MEASURE YOUR BELTS: If they are anything less than 50" then get the 42": even if they are 49.5" they are 42" belts: because belts do not shrink. They only stretch!
If your measurement is anything over 50" go with the 50" ones.

ALSO: If your wheel has serial number #138117 or after then you likely need the 42" belt.