It appears to be PVC sheeting with a teak
pattern surface. Similar to Lewmar's Treadmaster sheeting which are plain surface pattern.
- - So the item is really just a cosmetic addition unless you need it for anti-skid/slip purposes.
- - As with all things "glued" down you must be especially careful to clean and glue the product down properly or it won't be long before it starts to peel or lift
off the deck