These Zippy spacers designed for the JK Design Embargo Balisong are made in-house from a shatter-proof polyurethane. They modify the weight distribution of the Embargo, deepen the sound, add positive "saw-tooth" jimping to the Embargo and include a tungsten weight system for adjustable balance.
The Zippified Embargo (hole pattern variant) weighs 4,328 oz with Zippy spacers (and all 6x weights installed). Each Zippy spaceer weighs 0,066 oz empty, or up to 0.129 oz with 3x tungsten weights installed. For comparison, other Embargo spacers each weigh: