Patented SpaceAge Ceramic Guide Blocks for Delta 10" (28-195) band saws.  These create less friction and run cooler resulting in a longer lasting (40-50%) blade.  Ceramic guide blocks and thrust bearings outlast any other option on the market. 
Price is for set of 4.   Each is 3/8″ x 3/8″ x 3/4″


You may also want to check out our Thrust Bearings for this bandsaw found at 
https://www.ebay.com/itm/Delta-10-28-195-SpaceAge-Ceramics-Thrust-Bearings-Set/301821974172?hash=item4645fdd69c:g:ueUAAOSwcBhWambI:rk:35:pf:0