The Tacks 1052’s showcase JDP caps. The Joint Discharge Principle (JDP) uses the principle that the cap should disperse energy from an impact away from the fragile joint and into the big surrounding muscles. This concept is applied to the 1052 elbow cap and is widely popular with many players. To provide great mobility, the senior model of Tacks 2052 is designed as a 2-piece construction. The bicep guard is constructed with single density foam. In the forearm we have a single density foam overlay which is reinforced with a plastic insert to provide a really good wrap and lightweight protection.