The pro vibe 7s puzzle clamp a high performance lightweight oversized alloy 7075 t6 stem as used by top professional riders pro vibe 7s puzzle clamp features 3d forged 7075 t6 alloy construction increases strength and keeps the weight down innovative and secure puzzle clamp system evenly spreads load through the clamp area whilst reducing stem weight the gapless puzzle clamps interlocking design makes side movement loading impossible where traditional top bolts would be u