... tubes, made of PE or PS. different size. Test Tubes: Round bottom, PS material: 13x75mm, 12X75mm, 12x60mm, 16x100mm, 15x100mm, 13x100ml, 12x100mm ... Round botoom, PP material: 13x75mm, 12X75mmConical bottom, PS material: 16x102mmConical bottom, PP material: 16x102mmTubes with gratuation: 15ml ...