Speed Stacks G5 StackMat is only compatible with the G5 timer. The Speed Stacks timer is the only timer, which is approved for official WCA competitions. The G5 Speedcubing mat is designed for speedcubing, and the G5 StackMat is designed for cup stacking.
Speed Stacks G5 Speedcubing Mat Grey → MasterCubeStore
G5 StackMat™ Pro (Sport Stacking)
Speed Stacks - Pro Cube Pack (G5 Timer, Stackmat → MasterCubeStore
Speed Stacks, G5 Stackmat (Timer and Mat), Accuracy to 0.001 seconds, batteries included
G5 StackMat™ Pro Timer (Sport Stacking)
Speed Stacks, G5 Timer, Endorsed by Sport Stacking and Cubing associations
Speed Stacks
Speed Stacks G5 Speedcubing Mat Grey → MasterCubeStore
Speed Stacks []
Speed Stacks, G5 Timer, Endorsed by Sport Stacking and Cubing associations
Speed Stacks - Pro Cube Pack (Timer, Mat & Bag) → MasterCubeStore