Micro balloons is a common filler for epoxy when the surface will be faired.
Multi-Stage Dilation Balloons – MICRO-TECH EUROPE
Spacer 25x2x66mm - fits all EuroTrax ballon wheels with ball bearings
Micro Balloons (Microspheres or Glass Bubbles) | ZD-MB60 | Zero Designs
Micro Balloons (Microspheres or Glass Bubbles) | ZD-MB60 | Zero Designs
Physical description of a flexible multibody system | Download Scientific Diagram
Zero Designs Micro Ballons, Zero Paints ZD-MB60
Micro Ballon Brun 180 grs
Thickened Five Sided Cartoon Children's Balloon a Variety of Color Cartoon Patterns Micro Business Push Holiday Scene Layout|Ballons & Accessories| - AliExpress
Phenolic Micro-Ballon braun - Kugelförmig - Suter Kunststoffe AG