The brightest and most reflective collars on the market. The Lazer Brite collection uses the same 3M Scotchlite reflective material that is used by safety professionals including fire fighters, law enforcement and construction workers. Lazer Brite collars are visible to approaching motorists from critical braking distance up to 600 feet! The 3/8" wide adjustable collar expands from 8" - 12", the 5/8" wide adjustable collar expands from 12" - 18" and the 1" wide adjustable collar expands from 18" - 26".