Glass Suction Cup:Meet a high-quality glass sucker lifter that stands out. Designed with a seamless connection, it provides top-tier airtightness for enhanced suction power. Boasting the NBR material, it performs unfazed from chilly -4℉/-20℃ up to a toasty 140℉/60℃. Operation is a breeze: pump repeatedly to achieve vacuum suction and simply lift the latch for a quick release.