Mouth-blown into an engineered graphite mould, Bump is made of borosilicate, the heat resistant glass familiarly found in science laboratories. Light weight, durable and able to withstand high temperatures, borosilicate glass is usually seen in a colourless and clear state, but here it is elevated by the rare translucent greens and glossy black raw material, that have been fused, blown and manipulated into delicate shapes.