From Amazon
Bosch Professional 1x Expert C470 Sandpaper (for Hardwood, Paint on wood, 230x280 mm, Grit 400, Accessories Hand Sanding)
Conrad Electronic
Bosch Accessories EXPERT C470 2608900967 Sandpaper sheet Grit size 400 (L x W) 280 mm x 230 mm 50 pc(s)