- Poly-composite tags have reflective visibility and can be used in harsh and outdoor environments; withstands UV-exposure, chemicals, corrosion, and abrasion. 3/16" thick tag has a thick clear front which is sub-surface engraved and encapsulated by a safety-grade reflective sheet. 1-1/2"-dia. tag has 3/16" hole. Sequentially numbered in series sets of 25. Black on silver.