Low profile center blocks roll quickly across the trail while the siped transition knobs and shoulder blocks give purchase on almost every trail condition. Dual Tread compound and sealant compatibility in standard or racing TR formulas. DTC Dual Tread Compound is a combination of two different rubber compounds, L3R Pro center knobs and Stick-E rubber corner knobs . KSCT The optimization of existing Kenda tire construction technologies allowing for a tire to maximize the benefits of fluid based sealants while also increasing the strength of sidewalls for resistance to slices and abrasion. TLR/TR Tubeless Light Race is the lightest tubeless ready version of tires Kenda offers and also features an improved bead shape for better retention Tires Ken Havok Pro 27.5X2.8 Bk/Bsk/Dtc/Sct Fold