These large 2.5" single wheel casters offer excellent mobility on all floor surfaces. Your choice of hard or soft treads. Soft treads are designed for hard floor surfaces such as hardwood, linoleum, tile, parquet, concrete, chair mats, low pile carpet, etc. Hard treads are designed for use on carpet. Optional hood finishes include Nickle, Antique Brass or Black. Optional choice of caster brakes. These chair wheels offer your choice of stem options to fit almost any chair. Click here to view stem options. Please specify the stem option accurately. Easy installation, just pull out the old chair wheels and insert the new ones. This product is offered in your choice of 4 or 5 pieces per set, specify your choice below. Specify a quantity (Qty) of 1 for 1 set.. 2 for 2 sets.. etc. Satisfaction guaranteed, if product does 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.