Muc-Off Big Bore Hyrid Tubeless Valve Stems - Large 45mm PinkBig Bore Hybrid Valves provide ease of fill and maintenance by eliminating the inner valve core Flow is controlled by an internal ball valve controlled by an intergrated external lever Ball valve allows for 245% more flow than a standard valve with inner core 4mm machined hex key slot on bottom allows for easy installation and removal Hybrid model comes with a Schrader style valve sized head 60mm model has suggested rim depth of less than 20mm, 65mm