I got them on a small 38 lb. An oil-free compressor that I've been taking with me from job to job for 20 years. MY GOD! I wish Revain and these wheels were available back then. Now the compressor is much easier to move.
Pros
Non-scratch thermoplastic rubber wheels: non-toxic and environmentally friendly, resistant to most solvents. Shock-absorbing cushioning provides floor protection and quiet operation.