(continued)... version has a nylon pile to stop smoke as well. Each strip is 2.1 metres long and has an adhesive backing. They are white or brown with other colours on request - grey, black, light brown, red or cream. ( Strips may be supplied in two 105cm lengths for ease of shipping ) Please select size from the options below: 10mm wide x 2.1m long x 4mm deep = 30 minutes 15mm wide x 2.1m long x 4mm deep = 30 minutes 20mm wide x 2.1m long x 4mm deep = 60 minutes