Indasa PlusLine Rhynolox Plus Dry Sanding Sheets, 3A Series Grit:220B Grit Both boards are made of

Both boards are made of medium flexibility

The Rust Off was sprayed on the concrete and just left alone

Aluminum Oxide abrasive (60 to 1200 grit)

Sold 25 strainers per box

Indasa PlusLine Rhynolox Plus Dry Sanding Sheets, 3A Series Grit:220B Grit Both boards are made ofProduct Overview: Indasa PlusLine Rhynalox Plus Sanding Sheets (3A Series) offer extra flexibility for sanding shapes, edges and contoured surfaces and offers high performance on softer materials leaving a high quality finish. Anti clogging lubricant layer prevents pilling and rogue scratches. PlusLine sanding sheets are excellent for dry sanding and finishing fillers, primers, topcoats, clears, composite materials, woods and wood coatings. Sold in