KEY LASTIC SQT "Soft Quiet Topping" Rubber Chip System is a nominal 3/16 inch to 1/4 inch resilient polymer flooring system designed to provide acoustical quietness and comfort under foot. Key Lastic SQT is a smooth decorative terrazzo-like finish utilizing colored EPDM rubber particles to further the softness and wear. Key Lastic SQT is sealed with a satin or matte finish urethane sealer.