The VELA Hip Hop 300/300E has an integral central brake for a high level of stability. VELA Hip Hop 300 gas cylinder height adjustment. VELA Hip Hop 300E with electrical height adjustment. The integral central brake maximises safety and provides a high degree of stability. The hand brake locks all four wheels simultaneously, and is comfortably placed for operation by a standing adult. This ensures that even very unsettled children are sitting securely, even on rough surfaces. The locking mechanism means that it is not necessary to lock each wheel separately. By pushing the brake stick forward all wheels lock simultaneously. This enables child or helper to ensure that the chair is safely locked at all times.