Roland CB-BTRMX Black Series Instrument Bag for TR-8, TR-8S, or MX-1Custom Bag for the Tr 8s Tr 8 Rhythm Performer and Mx 1 Mix Performer Whether around town or on the road, your gear will travel safely and in style. Designed to perfectly fit the TR 8S, TR 8, and MX 1, the CB BTRMX delivers excellent protection in a lightweight design. Constructed with industrial grade materials and a soft fleece interior, this rugged instrument bag provides superior longevity and protection while on the move. Rolands Black Series.