This is a 12 inch x 24 inch pre-cut piece of Fender brown grill cloth (same as used on the 1959 Bassman amps). It is the grill cloth widely used on many amps. The piece should be large enough to fit most bass amp heads. Other sizes are available upon request. This is the genuine replacement cloth to restore your Fender amp to its original looks. Large pieces are shipped rolled up to facilitate it being ready to use when you get it. Part number 0036131002.