Polyester tennis string designed for spin and comfort. Incredibly soft. - Brand: DUNLOP - Model: EXPLOSIVE BITE - Gauge: 16g/1.32mm - Length: 12m/40ft - Material: Polyester - Color: Yellow I purchased two, but I haven't used them and have kept them in storage. The top of the package (photo 3) is slightly open, but this does not affect the string itself. Thank you for looking.