PS Luxury Twist Flake in the Erica second XL302 (also about 42 yrs old) with savinelli stem; 17mmx35mm chamber, This pipe holds 1/2 a flake less than the Sav 2614ks (20mmx42mm chamber) but simmers much slower for sipping and lasts far longer. What an incredible sipping pipe. It never ceases to amaze me.