3M(TM) Urethane Foam Tape 4314 Charcoal Gray, 1/4 in x 18 yd 25.0 mil, 36 per case 3M(TM) Urethane Foam Tape 4314 Charcoal gray, 6.4mm thick, open cell urethane foam with acrylic adhesive. 3M(TM) Urethane Foam Tape 4314, acrylic adhesive is protected by a tan, silicone treated paper liner. Very soft, conformable, low density foam which can help seal out air, dust and light when compressed 50 percent.