Blackburn's Core Slim mini pump serves up smooth action and reliable design wrapped into a complete alloy chassis for durability in the field. The clever design sees a handy thread-on presta-schrader valve fitted to the end of an extendable flex hose. The valve provides a secure fitment of the pump for proper inflation. The base of the Core Slim features a machined valve core tool for valve core service. The 9.75 inch pump has a mid-sized barrel diameter which allows for higher pressure on road and low volume inflation on larger tires.