These spiked rollers are vital in ensuring proper floor coating material adhesion. They are designed to be used on freshly applied floor coatings for the purpose of releasing trapped gas as well as to assist in the leveling process of several varieties of floor coatings. These rollers are easy to clean, allowing for repeated use. The applicator should wear spiked shoes while using a spiked roller. Solvent-resistant high density & ultra-high-molecular-weight polypropylene rollers for easy clean-up and extended wear. The 7/16” rollers have a 1/4” distance between each tip while the 13/16” rollers have a distance of 5/16”. The frames are heavy duty aluminum with high grade stainless steel axles except for the three 9” rollers that have paint style roller handles.