Universal Indoor Rowing Machine Mat- 8.5 x 2.3 FT Exercise Equipment Mat for Concept 2, Nordictrac, Sunny, Hydrow etc. Extra Long Non-Slip and Waterproof, Under Rower Floors Protection is up for auction in Sports & Outdoors. The current bid is $16.50, 59% below the $39.99 MSRP, in New/Like New condition. This auction has ended — similar items appear in live auctions regularly.