Listing is for one (1) Service Caster 6" diameter by 1-1/2" wide v-groove thermoplastic rubber wheel capable of supporting 300 lbs. per wheel. JX7-600 replacement part fits JX Propane Burnishers. When searching for a reliable and durable solution for a quiet and smooth rolling wheel that is suitable for a variety of different clean environments, consider Service Caster’s Thermoplastic Rubber on Polyolefin core caster wheel. With a ball bearing with 3/8" bore for axle, thermoplastic tread mechanically bonded to polyolefin core. Thermoplastic rubber is highly resistant to oil, grease, water, and most solvents. Hardness scale 70 +/- 5 Shore (A) Durometer. An excellent choice for clean environments. These versatile casters are ideal for a wide range of applications, but are commonly used on JX Propane Burnishers. Service Caster is unsurpassed in quality, reliability, and excellent customer service. Count on us to move you forward.