Professional Hand sanding blocks and abrasives from Festool
Sakazume Precision Sanding Block Small
How To Make A Simple Sanding Block - YouTube
3" Precision sanding block
Model Supplies » Modelmaking Tools » MT120
Prep Sanding Block Fine / Medium | Toolstation
3M Pro Grade Precision Dust Channeling Block Sanding Sponge 120 grit Fine, 2502TRI-120-CH, 11.4 cm x 6.4 cm x 2.5 cm, 12/Pack : Amazon.co.uk: DIY & Tools