H series 10x2.5 phenolic caster wheels are made from macerated canvas mixed with phenolic resin, and molded under high pressure and temperature. Its hardness is comparable to polished maple flooring. phenolic caster wheels are recommended for smooth concrete and can be used for storage(standing) loads without permanent set. come with straight roller bearing with drilled hardened steel spanner bushing. and each caster dynamic loading capacity. Wanda Casters since 1986 years, 30+ years' experience and monthly productivity over 50 containers