MOSCOW XL L/R Thumb Base Replacement thumb base with thumb cut-out Compatible with: Model 2 (Fast), Model 3 (Stable), Model 8 (Rainbow), Model 8* (Rainbow Elite), Model 9 (Super-Stable), Model 11 capsules. Note: Capsule sold separately. Requires retaining spring to secure capsule to base (available separately). Also required Thumb / Finger Elastic Strap – Spare Part for securing compass to thumb during orienteering – replaces worn or damaged straps (available separately)