The four Scalextric Track Extension Packs are totally flexible in their design. ANY of these packs can be added to ANY Scalextric circuit. Each pack can be incorporated into any Scalextric circuit, from simple ovals and figure-of-eight tracks to the largest layouts. ALL Track Extension Packs are fully compatible with standard AND Digital layouts. Requires C8525 Scalextric Start Converter Track Pack for use with Scalextric Start sets. One or more Track Extension Packs can be added to the same circuit at the same time. In fact, ALL the Track Extension Packs can be added to any layout to make a hugely impressive circuit incorporating all the feature track pieces. The reverse side of the packaging explains how the Track Extension Pack can be incorporated into an number of layouts. Features 'One size fits all' concept. Compatible with Digital and standard sets. Fits any sized circuit. Contents 4 x Standard Straight Track