3M Glass Bubbles K20 - Part#11WK21 (60# box)
K20 glass bubbles have a density of 0.2 g/cc and an isostatic crush strength of 500 psi. The general purpose K Series glass bubbles are the most economical 3M glass bubbles.

3M Glass Bubbles K37 - Part#11WK37 (630# box) & 11WK36 (25# & 100# Box)
K37 glass bubbles have a density of 0.37 g/cc and an isostatic crush strength of 3000 psi. The general purpose K Series glass bubbles are the most economical 3M glass bubbles.

3M Glass Bubbles S15 - Part#11WS15 (50# Box)
Because of their high strength-to-weight ratio and spherical shape, S15 glass bubbles are used by formulators to increase filler loading, lower viscosity, reduce shrinkage, reduce warping and increase buoyancy.

3M Zeeospheres W-210 Ceramic Microsphres - Part#11W210 (50# Bags)
Strong, hard, inert, thick-walled white hollow spheres with very high strength, particle size from 0.3-12 microns.

3M Zeeospheres G-200PC Ceramic Microsphres - Part#11W202 (50# Bags)
The 3M™ Zeeospheres™ Powder Coating (PC) grades have a refined effective top particle size which allows for smoother powder coating finishes as compared to our standard gray Zeeosphere grades. G-200PC has a particle size from 0.3-12 microns.