Soft tread chair wheels help to protect hard floor surfaces such as hardwood, linoleum, smooth tile, marble, parquet, chair mats, etc. These also work fine on most carpets. Narrow (.625") upper almond barrel. Almond chair wheels with soft polyurethane treads do not slip and scuff like hard nylon chair wheels. They are a standard size that will fit many typical office chairs, stools, etc: The top metal stem is 1" long and has a diameter of 7/16" thick. Caster wheel diameter of 2" for easy rolling on hard and soft surfaces. Pricing is per complete set of 5 chair wheels. Specify a quantity of 1 for 1 set.. 2 for 2 sets.. etc. Satisfaction guaranteed, if chair casters do not meet your needs, just return within 30 days for a refund. Shipping is not refundable. If you have any questions, just call toll free.