... A high-quality aluminum alloy with hardness of about 14 degrees, moderate tenacity, wall thickness of 1.2-3.0mm and high ... , decent, elegant, and more durable.- Rollers: ingeniously designed, made of imported stainless steel or fine copper bearing, high quality, and ... the effective error correction walls. They can be adjusted out of +/-15~20mm meeting with every bathroom wall requirement. Excellence: ...